UD5 Toolkit
CSS‑in‑JS Runtime Cost Simulator - Online Render 1000 Nodes
Render 1000 styled elements using inline styles vs. CSS classes and compare time. Understand CSS‑in‑JS trade‑offs.
Tag: CSS & JavaScript Benchmark
5+ toolscontent‑visibility: auto Benchmark - Online Render Cost
Toggle content‑visibility: auto on long blocks and see the rendering time difference. Understand this powerful property.
WebGPU Compute Benchmark - Online GPU Performance Test
Measure your browser's GPU compute power using a simple WebGPU matrix multiplication. See raw FLOPS and compare with peers. Fully client‑side.
Regex Catastrophic Backtracking Tester - Online Benchmark
Test a regex against long strings and measure execution time. Detect catastrophic backtracking patterns. Visual warning if slow.
CSS Paint Cost Benchmark - Online Measure Style Performance
Add many complex CSS styles and measure frames per second. Isolate expensive properties. Practical performance lab.