Review of PGO Data

45% increase not a result of PGO profiling of Google Maps.

I used build Firefox with only profiling of a page opening and then closing to check it against the loading times for Google Maps.

I re-ran all the tests and here is the summary of the results:

Firefox 3.0.3

Minefield PGO *

Minefield PGO **

2.15s (avg)

1.18s (avg)

1.17s (avg)

* Profiled using the Google Maps website.
** Profiled with only the browser opening then closing.

I also saved the Google Maps page on to my local server and when the pages were served from a local server the load times were all identical.

Serving Google Maps locally resulted in non of the javascript files Google Map uses being saved since they are loaded dynamically.

I have to conclude from this second performance test that minefield has some performance improvements not seen in Firefox 3.0.3 since the profiling did not improve Google Maps site loading.