If your laptop is running more slowly than usual or has become increasingly slow over the past several weeks or months, see the [https://www.ifixit.com/Wiki/Acer_Aspire_5253_Is_Running_Slowly|Acer Aspire 5253 Is Running Slowly problem page] for possible problems and solutions.
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The manual for your laptop says:
Mobile AMD Turion 64 processor ML-28/ML-30 or higher
Mobile AMD Sempron processor 2600+ to 3000+ or higher
are supported, that is where I would start out with if anything. I believe it's a PITA to change the CPU in one of those. The manual is available at [http://us.acer.com/ac/en/US/content/drivers|acer.com] a list for CPU's is at [http://products.amd.com/en-ca/NotebookCPUResult.aspx|AMD] and [http://en.wikipedia.org/wiki/List_of_AMD_Turion_microprocessors|here] is a least of the Turion 64 for the mobile computing market
Remember that speed and heat go together and that in order to make your computer more effective I would also look into increasing/changing memory and possibly optimizing your OS. Good Luck.
The manual for your laptop says that:
Mobile AMD Turion 64 processor ML-28/ML-30 or higher
Mobile AMD Sempron processor 2600+ to 3000+ or higher
are supported, that is where I would start out with if anything. I believe it's a PITA to change the CPU in one of those. The manual is available at [http://us.acer.com/ac/en/US/content/drivers|acer.com] a list for CPU's is at [http://products.amd.com/en-ca/NotebookCPUResult.aspx|AMD] and [http://en.wikipedia.org/wiki/List_of_AMD_Turion_microprocessors|here] is a least of the Turion 64 for the mobile computing market
Remember that speed and heat go together and that in order to make your computer more effective I would also look into increasing/changing memory and possibly optimizing your OS. Good Luck.