Check speed lack of new jquery functions / #2543

With about 400 tasks on Pentium M 1.2GHz:

• 2-3 Seconds for server side page request
• 5-7 seconds for loading
• 1-1.5 seconds striping with jquery
• less than a second for all other event handler assignments...

So we could improve performance by striping server sided but also sure reduce html size as suggested in reduce size of html-code