Thanks for all the comments on my last post! Due to popular demand I was also running the tests on Opera. During the first run Opera crashed after opening 140 tabs. The crash ID was “crash20110803153559?, whatever that means.
The following runs were more successful but I noticed a slowdown during rendering after about 120 tabs.
The timing results for Opera 11.50 are:
The results are similar to Firefox. Opera uses a single process with 290 threads and 2.5GB of RAM. For comparison: Firefox uses 27 threads and 2.02GB of RAM.
I was also running the V8 benchmarks on Opera with 150 other tabs:
Opera with a single tab: