Since your report seems to be that the browser isn't useable for you anymore under really any circumstances, I don't know what I can offer you. "Just make TenFourFox faster" isn't really a specific enough or reproduceable enough report for me to do anything with. For the record, I'm typing this reply to you in TenFourFox right now.
As you are running Leopard, perhaps Leopard Webkit would serve you better.
Well, just like the original poster I have to say that I very much appreciate you efforts, and at the same time acknowledge the same fault: FPR5 on my system (G5 dual 2.3/ 4,5 GB RAM/ 10.4.11) become incredibly slow after just mere days, beach ball spinning every now and again, and has to be restarted to return to some responsiveness (I have to admit that I have the bad habit of keeping the browser with several windows open at the same time and I suspect that this is the principal cause for the slowness and unresponsiveness I experience).
I see no other option but to go back to FPR3 or further. The original Firefox and later TFF were never speed-demons - Safari, not to mention Omniweb, were much more responsive - but with FPR4 I noticed decrease in responsiveness.
Maybe Cameron can unwind his spaghetti code this year.
Statements like that imply I'm either incompetent, don't care, or both. It's not appreciated. If this were something I could easily observe and correct, given that I'm typing this reply to you in the very browser itself, I would. If you believe either of those things about the browser and how I maintain it, then you should be using something else.
The best source is Japanese fermented soybeans called natto. Ask me
and I'll tell you how I grow my own and make a palatable pate.
Vitamin K2 can REVERSE heart disease, osteoarthritis, asthma,
periodontal disease, et.al.