Upgraded Android version to 5, it downgraded my game graphics.

Hey guys need some help, I recently upgraded my phone Samsung Galaxy E5 to Android 5.1.1 (manually). The phone is working perfectly well and there is no issue that I can come up with but one. I play Clash of Clans. The new version just downgraded its graphics. The images get little faded. This issue is only with this particular game while all the other games Run good with normal graphics. Plz recommend what I have to do is there any fix or should I downgrade to Android 4.4 (plz say NO)...??

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