diff --git a/frontend/assets/css/register-blocked.css b/frontend/assets/css/register-blocked.css
new file mode 100644
index 0000000..3a117d2
--- /dev/null
+++ b/frontend/assets/css/register-blocked.css
@@ -0,0 +1,108 @@
+:root {
+    --bg: #111827;
+    --card: #1f2937;
+    --border: #374151;
+    --text: #f9fafb;
+    --text-muted: #9ca3af;
+    --accent: #3b82f6;
+    --accent-hover: #2563eb;
+    --success: #10b981;
+    --error: #ef4444;
+}
+
+* {
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0;
+}
+
+body {
+    min-height: 100vh;
+    background: var(--bg);
+    color: var(--text);
+    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+    display: flex;
+    flex-direction: column;
+}
+
+body:not(.dashboard-layout) {
+    justify-content: center;
+    align-items: center;
+    padding: 1rem;
+}
+
+.card {
+    width: 100%;
+    max-width: 400px;
+    background: var(--card);
+    border: 1px solid var(--border);
+    border-radius: 16px;
+    padding: 2.5rem 2rem;
+    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
+    text-align: center;
+}
+
+.card h1 {
+    margin: 0 0 0.5rem 0;
+    font-size: 1.75rem;
+    font-weight: 700;
+    letter-spacing: -0.025em;
+}
+
+.card .subtitle {
+    color: var(--text-muted);
+    font-size: 0.95rem;
+    margin-bottom: 2rem;
+}
+
+.btn {
+    display: inline-flex;
+    justify-content: center;
+    align-items: center;
+    width: 100%;
+    padding: 0.85rem;
+    font-size: 1rem;
+    font-weight: 600;
+    border-radius: 10px;
+    border: none;
+    cursor: pointer;
+    text-decoration: none;
+    transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
+}
+
+.btn:active {
+    transform: scale(0.98);
+}
+
+.btn-secondary {
+    background: #1f2937;
+    color: white;
+    border: 1px solid var(--border);
+}
+
+.btn-secondary:hover {
+    background: var(--accent);
+    border-color: var(--accent);
+}
+
+.footer-text {
+    margin-top: 1.5rem;
+    font-size: 0.9rem;
+    color: var(--text-muted);
+}
+
+.message {
+    margin-top: 1.25rem;
+    padding: 0.85rem 1rem;
+    border-radius: 10px;
+    font-size: 0.9rem;
+    line-height: 1.4;
+    text-align: left;
+}
+
+.message.error {
+    background: rgba(239, 68, 68, 0.1);
+    border: 1px solid rgba(239, 68, 68, 0.2);
+    color: var(--error);
+    display: block;
+}
\ No newline at end of file
diff --git a/frontend/assets/js/auth.js b/frontend/assets/js/auth.js
index 5f43a5c..a844166 100644
--- a/frontend/assets/js/auth.js
+++ b/frontend/assets/js/auth.js
@@ -13,20 +13,15 @@
         return null;
     }
 
-    const cookieAccessToken = getCookie("access_token");
-    const cookieRefreshToken = getCookie("refresh_token");
-
-    const localAccessToken = localStorage.getItem("access_token");
-    const localRefreshToken = localStorage.getItem("refresh_token");
-
-    const accessToken = cookieAccessToken || localAccessToken;
-    const refreshToken = cookieRefreshToken || localRefreshToken;
-
-    if (!accessToken && !refreshToken) {
-        return;
+    function clearAllAuth() {
+        console.log("Clearing all auth remnants from cookies and localStorage...");
+        localStorage.removeItem("access_token");
+        localStorage.removeItem("refresh_token");
+        document.cookie = "access_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
+        document.cookie = "refresh_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
     }
 
-    async function tryTokenRefresh() {
+    async function tryTokenRefresh(refreshToken) {
         if (!refreshToken) return false;
 
         try {
@@ -51,19 +46,28 @@
             console.error("Refresh request failed:", err);
         }
 
-        document.cookie = "access_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
-        document.cookie = "refresh_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
         return false;
     }
 
     async function checkAuth() {
+        const cookieAccessToken = getCookie("access_token");
+        const cookieRefreshToken = getCookie("refresh_token");
+        const localAccessToken = localStorage.getItem("access_token");
+        const localRefreshToken = localStorage.getItem("refresh_token");
+
+        const accessToken = cookieAccessToken || localAccessToken;
+        const refreshToken = cookieRefreshToken || localRefreshToken;
+
         console.log("Auth check started...");
         console.log("AccessToken present:", !!accessToken);
         console.log("RefreshToken present:", !!refreshToken);
 
-        if (!cookieAccessToken && accessToken) {
-            console.log("Access token cookie missing, but present in localStorage. Forcing refresh...");
-        } else if (accessToken) {
+        if (!accessToken && !refreshToken) {
+            console.log("No tokens found. User is guest.");
+            return;
+        }
+
+        if (accessToken) {
             try {
                 console.log("Attempting ping with access token...");
                 const response = await fetch("/api/ping", {
@@ -76,7 +80,7 @@
                     window.location.href = "/dashboard";
                     return;
                 } else {
-                    console.log("Ping failed. Status:", response.status);
+                    console.log("Ping failed. Token might be expired. Status:", response.status);
                 }
             } catch (err) {
                 console.error("Network error during ping:", err);
@@ -85,24 +89,21 @@
 
         if (refreshToken) {
             console.log("Starting token refresh to rebuild cookies...");
-            const refreshSuccessful = await tryTokenRefresh();
+            const refreshSuccessful = await tryTokenRefresh(refreshToken);
 
             if (refreshSuccessful) {
                 console.log("Refresh successful! Redirecting to dashboard...");
                 window.location.href = "/dashboard";
                 return;
             } else {
-                console.log("Refresh failed. Staying on login.");
+                console.log("Refresh failed. Refresh token is invalid/expired.");
             }
         } else {
-            console.log("No refresh token present. User must log in normally.");
+            console.log("No refresh token present.");
         }
 
-        console.log("Authentication completely failed. Clearing remnants...");
-        localStorage.removeItem("access_token");
-        localStorage.removeItem("refresh_token");
-        document.cookie = "access_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
-        document.cookie = "refresh_token=; path=/; expires=Thu, 01 Jan 1970 00:00:00 UTC;";
+        clearAllAuth();
+        console.log("Authentication completely failed. Staying on current guest page.");
     }
 
     checkAuth();
diff --git a/frontend/handler.go b/frontend/handler.go
index 0521f51..aecea49 100644
--- a/frontend/handler.go
+++ b/frontend/handler.go
@@ -3,8 +3,13 @@ package frontend
 import (
 	"html/template"
 	"net/http"
+	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/tdewolff/minify/v2"
+	"github.com/tdewolff/minify/v2/css"
+	"github.com/tdewolff/minify/v2/js"
 )
 
 var dashboard = template.Must(template.ParseFiles(
@@ -116,7 +121,50 @@ func Projects(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+var minifier *minify.M
+
+func init() {
+	minifier = minify.New()
+	// Füge die Minifier für CSS und JS hinzu
+	minifier.AddFunc("text/css", css.Minify)
+	minifier.AddFunc("text/javascript", js.Minify)
+}
+
 func Assets(w http.ResponseWriter, r *http.Request) {
 	path := strings.TrimPrefix(r.URL.Path, "/assets/")
-	http.ServeFile(w, r, filepath.Join("frontend/assets", path))
+	fullPath := filepath.Join("frontend/assets", path)
+
+	w.Header().Set("Cache-Control", "public, max-age=3600")
+
+	var mimeType string
+	if strings.HasSuffix(path, ".min.js") {
+		mimeType = "text/javascript"
+		fullPath = strings.Replace(fullPath, ".min.js", ".js", 1)
+	} else if strings.HasSuffix(path, ".min.css") {
+		mimeType = "text/css"
+		fullPath = strings.Replace(fullPath, ".min.css", ".css", 1)
+	}
+
+	info, err := os.Stat(fullPath)
+	if err != nil || info.IsDir() {
+		http.Error(w, "Asset not found", http.StatusNotFound)
+		return
+	}
+
+	if mimeType != "" {
+		content, err := os.ReadFile(fullPath)
+		if err != nil {
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+			return
+		}
+
+		minifiedContent, err := minifier.Bytes(mimeType, content)
+		if err == nil {
+			w.Header().Set("Content-Type", mimeType)
+			w.Write(minifiedContent)
+			return
+		}
+	}
+
+	http.ServeFile(w, r, fullPath)
 }
diff --git a/frontend/htmx/404.html b/frontend/htmx/404.html
index 5507027..706579f 100644
--- a/frontend/htmx/404.html
+++ b/frontend/htmx/404.html
@@ -4,8 +4,8 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>404 - Page Not Found | MiauInv</title>
-    <link rel="stylesheet" href="/assets/css/theme.css">
-    <link rel="stylesheet" href="/assets/css/error404.css">
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+    <link rel="stylesheet" href="/assets/css/error404.min.css">
 </head>
 <body>
 
diff --git a/frontend/htmx/contents/dash/base.html b/frontend/htmx/contents/dash/base.html
index b4903eb..6fde30d 100644
--- a/frontend/htmx/contents/dash/base.html
+++ b/frontend/htmx/contents/dash/base.html
@@ -5,9 +5,9 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>{{ .Title }} | MiauInv</title>
     <script src="https://unpkg.com/htmx.org@2.0.4"></script>
-    <script src="/assets/js/api.js"></script>
-    <link rel="stylesheet" href="/assets/css/theme.css">
-    <link rel="stylesheet" href="/assets/css/dashboard.css">
+    <script src="/assets/js/api.min.js"></script>
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+    <link rel="stylesheet" href="/assets/css/dashboard.min.css">
 </head>
 <body class="dashboard-layout">
 
diff --git a/frontend/htmx/home.html b/frontend/htmx/home.html
index 2b1767d..f993eff 100644
--- a/frontend/htmx/home.html
+++ b/frontend/htmx/home.html
@@ -5,8 +5,8 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>MiauInv | Private Instance</title>
     <script src="/assets/js/auth.js"></script>
-    <link rel="stylesheet" href="/assets/css/theme.css">
-    <link rel="stylesheet" href="/assets/css/home.css">
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+    <link rel="stylesheet" href="/assets/css/home.min.css">
 </head>
 <body>
 
diff --git a/frontend/htmx/login.html b/frontend/htmx/login.html
index 17527a8..6fbbf8d 100644
--- a/frontend/htmx/login.html
+++ b/frontend/htmx/login.html
@@ -5,10 +5,10 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Sign In | MiauInv</title>
 
-    <script src="/assets/js/auth.js" defer></script>
-    <script src="/assets/js/login.js" defer></script>
+    <script src="/assets/js/auth.min.js" defer></script>
+    <script src="/assets/js/login.min.js" defer></script>
 
-    <link rel="stylesheet" href="/assets/css/theme.css">
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
 </head>
 <body>
 
diff --git a/frontend/htmx/register-blocked.html b/frontend/htmx/register-blocked.html
new file mode 100644
index 0000000..9953952
--- /dev/null
+++ b/frontend/htmx/register-blocked.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Registration Disabled - MiauInv</title>
+    <link rel="stylesheet" href="/assets/css/register-blocked.min.css">
+
+</head>
+<body>
+
+<div class="card">
+    <h1>Registration</h1>
+    <div class="subtitle">Create a new account</div>
+
+    <div class="message error">
+        <strong>Access Denied:</strong> Public registration is currently disabled for this system. Please contact your system administrator to request an account.
+    </div>
+
+    <div class="footer-text">
+        <a class="btn btn-secondary" href="/login" style="margin-top: 1.5rem;">Back to Login</a>
+    </div>
+</div>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/frontend/htmx/register.html b/frontend/htmx/register.html
index d7f8742..646d99d 100644
--- a/frontend/htmx/register.html
+++ b/frontend/htmx/register.html
@@ -4,8 +4,9 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Register | MiauInv</title>
-    <script src="/assets/js/auth.js"></script>
-    <link rel="stylesheet" href="/assets/css/theme.css">
+    <script src="/assets/js/auth.min.js"></script>
+    <script src="/assets/js/register.min.js"></script>
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
 </head>
 <body>
 
@@ -36,6 +37,5 @@
     </p>
 </main>
 
-<script src="/assets/js/register.js"></script>
 </body>
 </html>
\ No newline at end of file
diff --git a/frontend/htmx/register_blocked.html b/frontend/htmx/register_blocked.html
deleted file mode 100644
index 360f9f1..0000000
--- a/frontend/htmx/register_blocked.html
+++ /dev/null
@@ -1,134 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Registration Disabled - MiauInv</title>
-    <style>
-        :root {
-            --bg: #111827;
-            --card: #1f2937;
-            --border: #374151;
-            --text: #f9fafb;
-            --text-muted: #9ca3af;
-            --accent: #3b82f6;
-            --accent-hover: #2563eb;
-            --success: #10b981;
-            --error: #ef4444;
-        }
-
-        * {
-            box-sizing: border-box;
-            margin: 0;
-            padding: 0;
-        }
-
-        body {
-            min-height: 100vh;
-            background: var(--bg);
-            color: var(--text);
-            font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-            display: flex;
-            flex-direction: column;
-        }
-
-        body:not(.dashboard-layout) {
-            justify-content: center;
-            align-items: center;
-            padding: 1rem;
-        }
-
-        .card {
-            width: 100%;
-            max-width: 400px;
-            background: var(--card);
-            border: 1px solid var(--border);
-            border-radius: 16px;
-            padding: 2.5rem 2rem;
-            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
-            text-align: center;
-        }
-
-        .card h1 {
-            margin: 0 0 0.5rem 0;
-            font-size: 1.75rem;
-            font-weight: 700;
-            letter-spacing: -0.025em;
-        }
-
-        .card .subtitle {
-            color: var(--text-muted);
-            font-size: 0.95rem;
-            margin-bottom: 2rem;
-        }
-
-        .btn {
-            display: inline-flex;
-            justify-content: center;
-            align-items: center;
-            width: 100%;
-            padding: 0.85rem;
-            font-size: 1rem;
-            font-weight: 600;
-            border-radius: 10px;
-            border: none;
-            cursor: pointer;
-            text-decoration: none;
-            transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
-        }
-
-        .btn:active {
-            transform: scale(0.98);
-        }
-
-        .btn-secondary {
-            background: #1f2937;
-            color: white;
-            border: 1px solid var(--border);
-        }
-
-        .btn-secondary:hover {
-            background: var(--accent);
-            border-color: var(--accent);
-        }
-
-        .footer-text {
-            margin-top: 1.5rem;
-            font-size: 0.9rem;
-            color: var(--text-muted);
-        }
-
-        .message {
-            margin-top: 1.25rem;
-            padding: 0.85rem 1rem;
-            border-radius: 10px;
-            font-size: 0.9rem;
-            line-height: 1.4;
-            text-align: left;
-        }
-
-        .message.error {
-            background: rgba(239, 68, 68, 0.1);
-            border: 1px solid rgba(239, 68, 68, 0.2);
-            color: var(--error);
-            display: block;
-        }
-    </style>
-</head>
-<body>
-
-<div class="card">
-    <h1>Registration</h1>
-    <div class="subtitle">Create a new account</div>
-
-    <div class="message error">
-        <strong>Access Denied:</strong> Public registration is currently disabled for this system. Please contact your system administrator to request an account.
-    </div>
-
-    <div class="footer-text">
-        <a class="btn btn-secondary" href="/login" style="margin-top: 1.5rem;">Back to Login</a>
-    </div>
-</div>
-
-</body>
-</html>
\ No newline at end of file
diff --git a/frontend/htmx/under-construction.html b/frontend/htmx/under-construction.html
index f2e472f..c4ed2e7 100644
--- a/frontend/htmx/under-construction.html
+++ b/frontend/htmx/under-construction.html
@@ -4,8 +4,8 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Feature Under Development | MiauInv</title>
-    <link rel="stylesheet" href="/assets/css/theme.css">
-    <link rel="stylesheet" href="/assets/css/under-construction.css">
+    <link rel="stylesheet" href="/assets/css/theme.min.css">
+    <link rel="stylesheet" href="/assets/css/under-construction.min.css">
 </head>
 <body>
 
diff --git a/go.mod b/go.mod
index 9359228..b8461b1 100644
--- a/go.mod
+++ b/go.mod
@@ -5,15 +5,17 @@ go 1.26
 require (
 	github.com/glebarez/go-sqlite v1.22.0
 	github.com/golang-jwt/jwt/v5 v5.3.1
+	github.com/google/uuid v1.5.0
+	github.com/tdewolff/minify/v2 v2.24.13
 	golang.org/x/crypto v0.52.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/google/uuid v1.5.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/tdewolff/parse/v2 v2.8.12 // indirect
 	golang.org/x/sys v0.45.0 // indirect
 	modernc.org/libc v1.37.6 // indirect
 	modernc.org/mathutil v1.6.0 // indirect
diff --git a/go.sum b/go.sum
index 864d7a6..9a82097 100644
--- a/go.sum
+++ b/go.sum
@@ -12,6 +12,13 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/tdewolff/minify/v2 v2.24.13 h1:xrcF7gKDnUszseEY9WX9mUlZII2v2Go/QAcAwRASw58=
+github.com/tdewolff/minify/v2 v2.24.13/go.mod h1:emvwoYeIl8bfAKqRU5ww95LX9Gpggpqv/naal9a8Yq0=
+github.com/tdewolff/parse/v2 v2.8.12 h1:5BBjfaCv482v3nltlS0u6wH1xJaxjR6ofDrWttNvROg=
+github.com/tdewolff/parse/v2 v2.8.12/go.mod h1:Hwlni2tiVNKyzR1o6nUs4FOF07URA+JLBLd6dlIXYqo=
+github.com/tdewolff/test v1.0.11/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
+github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
+github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 golang.org/x/crypto v0.52.0 h1:RMs7fP2rXdep0CftQlK8Uf+kibLm7qkCcradZWYz988=
 golang.org/x/crypto v0.52.0/go.mod h1:1QgfPxDqh0T2M/elOJtp9RvuR95kVjir0e6/BvEmGbc=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
diff --git a/server/server.go b/server/server.go
index 65531d8..886069b 100644
--- a/server/server.go
+++ b/server/server.go
@@ -75,7 +75,7 @@ func (this *Server) Run() {
 	if this.AllowRegistration {
 		mux.HandleFunc("/register", utils.RenderFile("frontend/htmx/register.html"))
 	} else {
-		mux.HandleFunc("/register", utils.RenderFile("frontend/htmx/register_blocked.html"))
+		mux.HandleFunc("/register", utils.RenderFile("frontend/htmx/register-blocked.html"))
 	}
 
 	//