I need serious help for my samsung galaxy ace s5830

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http://androidforums.com – I own a galaxy ace s5830 and i have updated the version of the android using kies from 2.3.4 to 2.3.6 baseband version s5830DDKQ8 KENEL VERSION DPO@DELL166# and built version GINGERBREAD.DDKQ8 . THE Problem is that my mobile lags alot and is very slow when you type and very slow to respond .at the beginning i thought its because of my memory was full or virus .. so i formated every thing .. but then later i compared my friends galaxy ace s5830 same android version 2.3.6 and it had some differences in the font size, mine looked old and when you send files from Bluetooth (General)