sharepoint performance after running batch process

i am import list data using web.processbtachdata. it updated all data successfully wid out any 开发者_Go百科error. after tht successfull import whenever i click on any list it opens very late, say 40-50seconds depending on number of columns, why is it so? after tht frst click when i click on any other list including the current one it opens within 2 seconds or so...

em running sharepoint2007 on win 2003 server.. thanks in advance

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It sounds like you have too many items in the view.

http://technet.microsoft.com/en-us/library/cc262787%28office.12%29.aspx

Item

2,000 per view

Testing indicates a reduction in performance beyond two thousand items. Using indexing on a flat folder view can improve performance.

List view

Or you are not disposing of SharePoint objects correctly.

If you can check perf counters on servers, high WFE load/mem will likely mean a dispose issue, spiking sql cpu, probably view too big.