Cosmatae ToolsFree
Performance Checker
Understand how quickly your experience loads and where the biggest opportunities are for a smoother, faster product.
Results in minutes Private by default Actionable output
See the bottleneck
Separate a slow network, heavy asset, and runtime issue from the symptoms.
Improve the first visit
Prioritise the changes users feel before they ever reach your product.
Track progress
Compare future runs as the team ships improvements.
Start here
Run a performance check
Report preview
Waiting for inputLoad experienceNot run
Core Web VitalsNot run
Asset weightNot run
Runtime opportunitiesNot run
Free for signed-in users. These website checks do not use monthly credits.
Next step
Turn insight into momentum.
Use Cosmatae Feedback to review a real website or design with pins, comments, approvals, and tasks in one shared workspace.