Background analyzers can eat CPU. ✅ Fix Disable unused analyzers: Tools → Options → Text Editor → C# → Advanced Turn off: Full solution analysis
Day: December 13, 2025
WordPress Slow Admin Panel? Heartbeat API
WordPress sends frequent AJAX calls. ✅ Fix Install Heartbeat ControlReduce frequency or disable in admin. Result Faster editor Lower CPU usage
Windows 11 Micro-Stutters in Apps? Disable MPO
Multi-Plane Overlay causes flickering and stutter. ✅ Fix (Registry) DisableMPO = 1 (Path: GraphicsDrivers)
Windows 11 Laptop Slow on Battery? CPU Throttling
Windows limits CPU aggressively. ✅ Fix powercfg /setactive SCHEME_MIN Or switch to Best Performance power mode.
AJAX Requests Fail Randomly? CSRF Token Missing
POST requests fail silently without CSRF token. ✅ Fix headers: { ‘X-CSRF-TOKEN’: token } Common victims Laravel Django ASP.NET MVC
JS “await” Inside forEach Is a Bug
This does NOT work: items.forEach(async item => { await process(item); }); ✅ Correct Patterns for (const item of items) { await process(item); } or parallel: await Promise.all(items.map(process));
HTML5 Lazy Loading Without JavaScript
Stop writing JS for images. <img src=”image.jpg” loading=”lazy” /> Benefits Faster page load Better Core Web Vitals Zero JavaScript
CSS 100vh Is Broken on Mobile (Real Fix)
height: 100vh breaks on mobile browsers. ✅ Correct Solution height: 100dvh; Or fallback: min-height: -webkit-fill-available; Why Mobile address bars change viewport height dynamically.
ASP.NET Core Thread Pool Starvation Explained
Symptoms: Random timeouts CPU low but requests hang Root cause Blocking calls inside async code: Task.Delay(1000).Wait(); ✅ Fix await Task.Delay(1000); Rule Never block threads in ASP.NET.
ASP.NET Core Logging Slows Your API (Yes, Really)
This is expensive: _logger.LogInformation($”User {id} logged in”); ✅ Correct Way _logger.LogInformation(“User {UserId} logged in”, id); Why Avoids string interpolation Enables structured logging Reduces allocations
SQL Index Exists but Still Not Used? Here’s Why
SQL ignores indexes when: Data type mismatch Implicit conversion Example problem: WHERE UserId = ‘123’ — string ✅ Fix WHERE UserId = 123 — int Golden rule Indexes only work when types match exactly.
SQL COUNT(*) Is Slower Than You Think
This query scans rows: SELECT COUNT(*) FROM Orders; ✅ Faster Metadata Count (Approximate) SELECT SUM(row_count) FROM sys.dm_db_partition_stats WHERE object_id = OBJECT_ID(‘Orders’) AND index_id IN (0,1); Use when Dashboards Monitoring Large tables
C# ValueTask — The Hidden Performance Weapon
Most async methods return Task<T> even when they complete synchronously. ✅ Better for hot paths public ValueTask<int> GetCachedValueAsync() { return ValueTask.FromResult(42); } When to use Cache hits High-frequency calls Allocation-sensitive paths
C# Dictionary Lookup Slow? You’re Using It Wrong
This is inefficient: if (dict.ContainsKey(key)) value = dict[key]; ✅ Correct Way if (dict.TryGetValue(key, out var value)) { // use value } Why Avoids double hash lookup Faster under high frequency usage
C# Task.WhenAll Can Kill Your Server (Concurrency Trap)
This looks innocent: await Task.WhenAll(requests.Select(r => ProcessAsync(r))); But if requests = 10,000 items →you just spawned 10,000 concurrent tasks. ✅ Safe Pattern using var semaphore = new SemaphoreSlim(10); await Task.WhenAll(requests.Select(async r => { await semaphore.WaitAsync(); try { await ProcessAsync(r); } finally { semaphore.Release(); } })); Why this matters Prevents thread starvation Protects downstream services Stabilizes […]