On an average system, say
Processor: Core 2 Duo 2.2 GHz, Memory: 4 GB
How much DOM-manipulations can javascript make? Is there a way to see how long (in milliseconds) a simple jQuery action takes? For example one like:
$("#example").css("color","red");
If you're browser supports it, you could use console.profile();
before the call(s) and console.profileEnd();
after. You console should show you output how long it took, the number of calls, etc.
console.profile();
$("#example").css("color","red");
console.profileEnd();
Nettuts+ has a tutorial here.