985262 - Slower performance than Chrome on Voronoi polygon computations

Status: NEW

(Core :: JavaScript Engine, defect, P3)

Description

[Boris Zbarsky [:bzbarsky]]

Steps to reproduce:

1) Load http://www.raymondhill.net/voronoi/rhill-voronoi-demo1.html
2) Check the number in the textfield from "100" to "10000"
3) Click the "Benchmark" button.

I see us end up with about execution 130ms, while Chrome is at about 100ms.  This is on Mac.

The claim is that the time measured does NOT include the canvas drawing bits, so ought to be pure JS time.

Comment 1

[Hugh Nougher [:Hughman]]

On Windows 8 Nightly its a bit close to call:
Nightly: average exec time for 10000 sites = 103.3 ms (10.3 µs/site), fastest = 92 ms, slowest = 264 ms.
Chrome: average exec time for 10000 sites = 97.5 ms (9.8 µs/site), fastest = 71 ms, slowest = 139 ms.

It's not really related to this bug but I noticed that the canvas displaying was visually *much* slower in Nightly than Chrome.

Comment 2

[Nicolas B. Pierron [:nbp] {away}]

Testing on Linux, with 10000:
Firefox: average exec time for 10000 sites = 90.8 ms (9.1 µs/site), fastest = 79 ms, slowest = 117 ms.
Chromium: average exec time for 10000 sites = 62.9 ms (6.3 µs/site), fastest = 54 ms, slowest = 126 ms.