Deschide o pagina care are multe Javascripturi intr-un browser al unui pentium 2 si in acelasi browser, la un pentium 4. Asta in conditiile in care sistemul e curat si nu are aplicatii care ruleaza in background ( spyware etc ).
O situatie pe care am gasit-o pe un forum: "My computer has a strange quirk in that it practically grinds to a halt
when confronted with any web page that has JavaScript on it. The
Windows Task Manager reflects that the CPU is running at 100%. The CPU will stay at 100%, and the computer
excruciatingly sluggish, until all the Javascript-site windows are
closed." O formatare ar rezolva problema
Prefer Javascript ul. Si mai nou, al functiile Ajax.