Increasing the memory in your Mac will often make the biggest difference, and is relatively cheap – especially if you’re currently running on 4GB, which is probably too tight for
comfort. Check the Memory tab in > About This Mac or use the System Scanner at uk.crucial.com to identify the type of memory your computer requires. Bear in mind that not all Macs can have their
memory upgraded. In recent MacBooks it’s soldered on to the motherboard, so you’re stuck with the factory-supplied chips. The same is true of the late 2014 Mac mini. Avoid mixing different memory types – particularly in the Mac Pro, where you shouldn’t combine UDIMMs and RDIMMS – and wherever possible replace all of the memory in one go, filling the slots with modules of equal size.