File Explorer problem

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File Explorer is really slow when opening or scrolling folders which contains picture files? For other file types it works normally. This problem is not about ROM, becouse this is happening on second I tried in few last days. Maybe it's about HTC Album, becouse I set it for default app for opening pictures?

Thanks!

P.S. sorry for my english

Problem is solved.. It's becouse I changed default application for opening pictures with RESCO Explorer 2010. I noticed that it's a problem after changing default application for video files, and after that scrolling and opening that file types was also slow.
I fixed it with Hard Reset..