Try it›Load test

Load test

See what glass costs on your own device. Choose how many pieces to draw and whether they move. The numbers are measured in this browser, right now.

How to read it

Your screen sets the ceiling, usually 60 or 120 frames per second. A frame under 16 ms is enough for 60. If the numbers hold with the pieces you plan to use, you are fine.

Turn off Moving and glass stops drawing altogether. The counter keeps ticking because the browser does, not because glass works.

What adds load

Moving pieces, large areas of glass, and sources that change every frame, such as video or live. Pieces that stand still add almost nothing, and glass off screen is skipped.

Glass that overlaps other glass is the most expensive case, because it has to redraw what lies under it. Up to 8 such pieces do this per frame. The rest look straight through to the backdrop, so a dense crowd stays smooth.