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you'll need to give a lot more detail than that to get useful help
what mac book, what spec, what OS is it running, how does it seem slow, doing everything/specific things, when does the rainbow wheel appear ? etc etc.
I really am a techfcktard.
Boom-tish.
I would also suggest opening up a Terminal and typing:
sudo periodic daily weekly monthly
press return and you will probably have to enter your password. Just leave it for a few minutes until it's done.
Then open up disk utility and select Macintosh HD (or whatever your HD is called) and repair your disk permissions and also verify disk. Report any errors you may find here.
After this you should reset your NVRAM and SMC following the instructions here:
https://support.apple.com/en-gb/HT204063
https://support.apple.com/en-gb/HT201295
Oh Andrew, they're only going to be a perky C cup.
Those memory apps generally aren't recommended. If your machine is slow you should follow the advice I posted earlier and see how it goes. If it still is going slow then have a look in the console for anything untoward -i.e. lots of error messages from a particular programme.
(Eeek).