first add

client/test-speed.ps1

@@ -0,0 +1,58 @@
+param(
+    [ValidateSet("http","socks")]
+    [string]$Mode = "http",
+
+    [int]$SizeMB = 50
+)
+
+# Build proxy value and target URL
+$proxy = if ($Mode -eq "http") { "http://127.0.0.1:8080" } else { "socks5h://127.0.0.1:1080" }
+$envVar = if ($Mode -eq "http") { "HTTPS_PROXY" } else { "ALL_PROXY" }
+$bytes = [int64]$SizeMB * 1MB
+$testUrl = "https://speed.cloudflare.com/__down?bytes=$bytes"
+
+Write-Host "Mode: $Mode  Proxy: $proxy  Size: $SizeMB MB" -ForegroundColor Cyan
+
+# Set proxy env only for this process
+[System.Environment]::SetEnvironmentVariable($envVar, $proxy, 'Process')
+
+function Test-Health {
+    try {
+        Write-Host "Checking server health via proxy..." -ForegroundColor Yellow
+        $health = & curl.exe -I https://molecular.eu.org/_health 2>&1
+        $line = ($health | Select-String -Pattern "HTTP/").ToString()
+        Write-Host $line -ForegroundColor Green
+    } catch {
+        Write-Host "Health check failed: $_" -ForegroundColor Red
+    }
+}
+
+function Test-Download {
+    param([string]$Url)
+    Write-Host "Running download test: $Url" -ForegroundColor Yellow
+    $result = & curl.exe -sS -o NUL -w "time_namelookup=%{time_namelookup} time_connect=%{time_connect} time_starttransfer=%{time_starttransfer} time_total=%{time_total} speed_download=%{speed_download}\n" $Url
+    if (-not $result) { Write-Host "curl produced no output." -ForegroundColor Red; return }
+
+    $kv = @{}
+    foreach ($pair in $result.Trim().Split(' ')) {
+        if ($pair -match "=") {
+            $k,$v = $pair.Split('='); $kv[$k] = [double]$v
+        }
+    }
+    $mbps = [math]::Round(($kv['speed_download'] * 8.0) / 1e6, 2)
+    Write-Host ("Latency(connect): {0} s | TTFB: {1} s | Total: {2} s | Throughput: {3} Mbps" -f `
+        $kv['time_connect'], $kv['time_starttransfer'], $kv['time_total'], $mbps) -ForegroundColor Green
+}
+
+Test-Health
+Test-Download -Url $testUrl
+
+# Optional: run a smaller warm-up and a larger sustained test
+if ($SizeMB -lt 20) {
+    Test-Download -Url "https://speed.cloudflare.com/__down?bytes=20000000"  # 20MB
+}
+if ($SizeMB -lt 100) {
+    Test-Download -Url "https://speed.cloudflare.com/__down?bytes=100000000" # 100MB
+}
+
+Write-Host "Done." -ForegroundColor Cyan