We do not hear much of differences in speed between browsers for tiddlywiki except when you place a higher demand such as total size embeded images etc.. where nodejs is used it can help as will external images.
Otherwise performance is more often limited by browser or general computer resources.
If you hit a performace problem or can suggest a use case we can give you more help.
For me I use multiple tws and access methods and have no problems do far.
Regards
Tony
who can tell me wich is the faster platform version of TW, if there is any ?
It all depends on context and needs.
Tony
For firefox, reboot the browser and don't open more tabs than you really need.