Problem with ajax requests in Firefox

[sarahaziz]

Hello guys
I cerated this chat system with several ajax requests(using jquery).Now i have several ajax requests on a page, it works fine with safari but on firefox it causes a problem of slowness that sometimes when i write a message some letters are missing.
This could be the problem of function, browser or network?

[Dormilich]

this is impossible to tell without a link to the page.