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Have you checked if you're running out of available ram with daily usage?

If so more ram.

Or if you really want to improve it get an SSD. Biggest performance upgrade you can do.

Although if it's randomly been really slow lately you should solve that first. What does the activity monitor say?
 
Have you checked if you're running out of available ram with daily usage?

If so more ram.

Or if you really want to improve it get an SSD. Biggest performance upgrade you can do.

Although if it's randomly been really slow lately you should solve that first. What does the activity monitor say?

I'm considering swapping hdd for SSD but don't want to mess up my macbook.
 
Get to the root of the problem first.

Typical causes:

1. Too little RAM - check it with Activity Monitor
2. Too little disk space - get rid of stuff you don't need, empty trash
3. Too many apps left running - close those not being used

Cheers.
 
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