Blob cache : RewriteUrl failed with exception and intranet performance slow

Blob cache : RewriteUrl failed with exception The Web application

 at http://intranet.xxx.gov.local/Style Library/Images/ssjq/slidedeck.jquery.js could not be found. Verify that you have typed the URL correctly. If the URL should be serving existing content, the system administrator may need to add a new request URL mapping to the intended application..   Stack Trace  

 at Microsoft.SharePoint.SPSite..ctor(SPFarm farm, Uri requestUri, Boolean contextSite, SPUserToken userToken)   

 at Microsoft.SharePoint.SPSite..ctor(String requestUrl)