Sorry if this is not the correct forum.
I have been given a Macbook pro from a customer, it has a knackered battery and damaged lid, no big deal.
The Macbook is an early 2011, 8GB DDR3 RAM and i5 2.3GHz processor ( sorry I dont know if dual core or quad core )
As the customer had all sorts of Adobe software ( Photoshop and the like ) I thought that this was slowing it down.
I upgraded the OS to Mavericks 10.9.4 and this made no change ( no real surprise there )
I removed the hard drive and installed a new ( old stock ) 320GB Hdd and installed a fresh copy of Mavericks.
The mackbook is still sluggish, it will take several seconds to open up screens and change screens. All that is on the laptop is the OS, my emails via macmail and adobe reader.
I dont know a lot about Mac, this is why I lept at the chance of being given one, but it is really frustrating.
If this was a PC a fresh install of W7 or W8.1 it would be flying.
I don't want to change the battery or put in a SSD unless I know that the mac is usable.
Is there any advice that anyone can give me, please be gentle as I know very little about mac's.