Speed up runspace and tab initialization (#4793)

* Add startup performance tracing

* Lazy initialize non-default tabs

* Render install app entries incrementally

* Defer and cache toggle status checks

* Clean up runspace invocation ownership

* Defer GUI runspace pool startup

* Defer status taskbar asset rendering

* Record final speed verification

* Fix deferred install render timer callback

* Add dispatcher smoke coverage for install rendering

* Replace install render timer with dispatcher callbacks

* Gate performance tracing behind compile switch

* Clean up analyzer warnings in speed changes

* Speed up runspace and tab initialization

tools/perf/Start-WinUtilPerformanceTrace.ps1

@@ -0,0 +1,14 @@
+function Start-WinUtilPerformanceTrace {
+    if (-not (Test-WinUtilPerformanceTrace) -or $null -eq $sync) {
+        return
+    }
+
+    if (-not $sync.ContainsKey("PerformanceTrace")) {
+        $sync.PerformanceTrace = @{
+            Stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
+            LastElapsedMs = 0.0
+        }
+    }
+
+    Write-WinUtilPerformanceCheckpoint -Name "Startup trace started"
+}

tools/perf/Stop-WinUtilPerformanceTrace.ps1

@@ -0,0 +1,15 @@
+function Stop-WinUtilPerformanceTrace {
+    param(
+        [string]$Name = "Startup trace complete"
+    )
+
+    if (-not (Test-WinUtilPerformanceTrace) -or $null -eq $sync -or -not $sync.ContainsKey("PerformanceTrace")) {
+        return
+    }
+
+    Write-WinUtilPerformanceCheckpoint -Name $Name
+
+    if ($null -ne $sync.PerformanceTrace.Stopwatch) {
+        $sync.PerformanceTrace.Stopwatch.Stop()
+    }
+}

tools/perf/Test-WinUtilPerformanceTrace.ps1

@@ -0,0 +1,12 @@
+function Test-WinUtilPerformanceTrace {
+    $enabledValue = ([string]$env:WINUTIL_PERF_LOG).ToLowerInvariant()
+    if ($enabledValue -in @("1", "true", "yes", "on")) {
+        return $true
+    }
+
+    if ($null -ne $sync -and $sync.ContainsKey("PerformanceTraceEnabled")) {
+        return [bool]$sync.PerformanceTraceEnabled
+    }
+
+    return $false
+}

tools/perf/Write-WinUtilPerformanceCheckpoint.ps1

@@ -0,0 +1,23 @@
+function Write-WinUtilPerformanceCheckpoint {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Name
+    )
+
+    if (-not (Test-WinUtilPerformanceTrace) -or $null -eq $sync) {
+        return
+    }
+
+    if (-not $sync.ContainsKey("PerformanceTrace") -or $null -eq $sync.PerformanceTrace.Stopwatch) {
+        $sync.PerformanceTrace = @{
+            Stopwatch = [System.Diagnostics.Stopwatch]::StartNew()
+            LastElapsedMs = 0.0
+        }
+    }
+
+    $elapsedMs = [math]::Round($sync.PerformanceTrace.Stopwatch.Elapsed.TotalMilliseconds, 2)
+    $deltaMs = [math]::Round($elapsedMs - [double]$sync.PerformanceTrace.LastElapsedMs, 2)
+    $sync.PerformanceTrace.LastElapsedMs = $elapsedMs
+
+    Write-WinUtilLog -Level "DEBUG" -Component "StartupPerf" -Message ("{0}: {1:N2} ms (+{2:N2} ms)" -f $Name, $elapsedMs, $deltaMs)
+}