Browser performance: Opera vs. Firefox/Seamonkey in OpenBSD and Puppy

I know that application startup time isn't everything. But it's definitely something.

Here are the numbers for Puppy 2.13 and OpenBSD 4.2 on the $15 Laptop (Compaq Armada 7770dmt, 233 MHz Pentium II MMX, 144 MB RAM):

OpenBSD
Firefox 2.0.0.6: 120 seconds
Opera 9.22: 37 seconds

Puppy Linux 2.13
Seamonkey (Mozilla-based): 30 seconds
Opera 9.02: 34 seconds

Analysis: Firefox/Mozilla is a fairly heavy application, but the Seamonkey version of Mozilla does quite well in Puppy, where it beats Opera slightly when it comes to start time.

But in OpenBSD, Opera is a standout for some reason, starting in about a third of the time that Firefox takes to start. Opera works with Movable Type much better in OpenBSD, with no stalled-script messages.

Question: Is there any way to run Mozilla browser code faster than Firefox? I need to test Firefox in Puppy (and, if I had the space, Seamonkey in OpenBSD) to fill out the data.

Conclusion: Application startup and response time is extremely critical with older machines. Since most of my computing time is spent in Web browsers, I welcome the speed and functionality of Opera in OpenBSD; it has pretty much given this OS a proverbial "new lease on life."