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I have Acer Aspire 5741 (4GB RAM, Core i5, 500GB HDD, Intel HD Graphics) I use Ubuntu 64bit 12.04, before it i used 11.10. Also i have tested 12.10. I have same problem and it is not about OS version. Ubuntu runs slow with my laptop. I open SYSTEM MONITOR and see that CPU usage is about 10-15%, RAM usage is about 40-60%, but system runs too slow. After startup it runs slow, after opening 8-9 tab in Chrome it begins working bare slow. And at that time i check for system monitor and i see that CPU and RAM usage is normal (10-20% and 40-60%). So, it seems that Ubuntu can't use all resourses of my laptop. Any ideas what to do?

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That ram usage seems like a lot. Is it Chrome that's using it all? Have you tried running something like iotop to see if it's disk access that's slowing you down? –  Ash Apr 8 '13 at 6:25
Hey Ash. No, Chrome uses at least 700M, maximum 1.5Gb, not more. I often check its usage. Plus Ubuntu's some apps(nautilus, gnome control center...), Dropbox, Sublime Text 2.. and sum of those usages are nearly 2-2.5Gb. But my laptop has 4GB RAM and it should not be any problem with 2.5Gb. And i also has 11Gb Swap memory. Iotop? Noo, let me check what it is. –  Elvin85 Apr 8 '13 at 6:31
If it all fits in RAM, yeah, it should be okay. If it starts swapping out, you will probably notice the hit in performance, which may be what's happening. Also: dropbox, file manager, text editors surely shouldn't be using 2+GB if they're operating normally? –  Ash Apr 8 '13 at 6:55
No, those apps don't use 2Gb, i meant all apps together use it. Chrome,Gnome CC, Nautilus, Dropbox... all together. Yeah, it all fits in RAM. But sometimes when laptop work too slow, i see that in swap there is ~1Gb use. But at the same time RAM has at least 1GB free space. So it seems some part of RAM is shown as available, but actually its not available. I use 64bit version, so it should not be so. –  Elvin85 Apr 8 '13 at 7:00
I opened 10-15 tabs, runned copy/pasting of 2GB sized file, opened youtube video, and opened firefox. And i kept system monitor opened . After several seconds laptop got too slow, even cursor got frozen. And i took screenshot of system monitor in that time. Please check it: dl.dropbox.com/u/22319935/… –  Elvin85 Apr 8 '13 at 7:13
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