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I recently replaced my 32-bit 12.04-LTS by 64-bit 13.04, but the 64-bit version runs VERY slow on my current computer (compared with the speed when I run 32-bit). Here is the info of the hardware:

  • CPU: AMD E-350 1.6GHz (announced in Nov 2010)
  • Graphics: Radeon HD 6310
  • RAM: 6GB 1066-MHZ

When I first bought this computer, it run Windows 7 64-bit very well: basically just like a desktop only when I run huge applications. My guess is that though my computer should be able to run 64-bit version Linux, but the hardware was too old and actually reduced the performance, just like if you run Windows 8 on an old Pentium 4 platform.

Plus, for the first several times I installed this 64-bit version, after my computer started, it shows that "cannot find operating system", which is very weird. Does anyone know why that happened?

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It's not really a fair test you're doing there. The difference between 12.04 and 13.04 is not small and could easily explain the difference in speed, regardless of the 32/64bit change. If it's too slow, go back to 12.04 (try the 64bit version). –  Oli May 16 '13 at 14:07

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