There was an issue in SilkPerformer 2010 R2 WS1 and SilkPerformer 2011 where the caching parameter 'REVISITING' does not take effect.  With this issue, any call to the BrowserStart function is resetting the cache and therefore always running as 'FIRST_TIME'.  This means that any embedded objects get re-requested even when caching should be used instead.

Although this issue was resolved with hotfixes 'SP82_Hotfix09_BDLT_Rendering' and 'SP83_HF1_BDLT_Rendering' we would recommend upgrading to the latest version of SilkPerformer.