asp.net ajax update panel -

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i have asp.net webpage , im using ajax timer trigger set refresh every 5 seconds. have few tables under update panel background image. works fine except first time updates, table images flickers. after that, not flicker when updates. ideas??

i think occurs backgroung image takes time loads. please keep background iamge minimum size possible , add single html image on page image hidden. there on page , no need reloaded each , every time.


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