Frontend Engineering
Fix Main Thread Blocking — Without Re-launching Your Site
Build-pipeline + runtime fixes without breaking the design
Senior engineers · IST + EST overlapNDA on day 124-hour reply
The problem
What you're seeing
Lighthouse reports 1500ms+ of total blocking time and the page is unresponsive for the first few seconds.
How we fix it
Our approach
We split long tasks with scheduler.yield + idle callbacks, push CPU-heavy work into web workers, and async-load every non-critical script.
What you get
Concrete deliverables, no fluff
Every engagement ends with measurable, documented outcomes — no black-box agency reports.
Diagnostic report with reproducible steps
Implementation merged behind a PR you review
Verified fix across browsers and devices
Knowledge transfer to your engineering team
Tooling we use
Industry-standard stack, no proprietary lock-in
TypeScriptWebpackViteesbuild