[ubuntu] upgraded from 10.04 to 12.10 and is very slow

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http://ubuntuforums.org – Hi everyone, This may have been asked before and it it has I would be happy to read any thread someone can direct me to. I have an older Pentium 4 dual core 3.3Ghz with 1 gig Ram. I was running Ubuntu 10.04 and the machine was very fast. I loved it. I then upgraded to 12.04, now 12.10 and the machine runs very slow. I don't know much about linux but i did run a top command and things looked pretty good. Swap was low, memory was 890K out of the one gig but I think this is normal as once you load something it stays in memory until something new is loaded?? Processor load was down about 6 (Hardware)