mac book - runnning slow. word ,mail freezes intermitently

Hi guys,
Am new to mac world. and got a user who has mac probook(High Sierra). its running slow. freezes intermitently.
I googled and did few tasks, like clearing cache files., ran maintenance scripts from cleammymac3. checked for updates. still no luck. running slow.
From activity monitor found, calender agent takes around 1.06gb ram, kernel_task-959.5mb ram . how do i troubleshoot these 2 things. why its taking too much of ram ?
Could anyone help me with this.

Thanks
Mr.XAsked:
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Eoin OSullivanConsultantCommented:
CleanMyMac is not really much good.. it runs a lot of scripts which OSX can do anyway by default and I'd not recommend buying or using it.

If the MacBook Pro is slow or freezing/crashing then I'll do a few things
Use Activity Monitor to see what is running and if anything looks unusual (BTW kernel_task is NORMAL and will always be high - on the other hand Calendar Agent should be much lower so that might indicate some issue)
Disable and remove all Startup Items you don't need

A good quick trick is to start by creating a NEW user account on the Mac and login and see if the MacBook performs better .. that can point to specific issues.

Disable WiFi / Internet and reboot and see if the MacBook works better when offline (again this can indicate that some online services are the issue)
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serialbandCommented:
First steps to "repairing" a Mac is to reset the SMC, then Reset the PRAM.  Both of these are rather quick, so it's easy to get these out of the way before attempting anything else. that's much more time consuming

To reset a Macbook Pro, with a non-user serviceable battery.
  • Turn off the Macbook Pro
  • Plug in the power cord
  • Press and hold the 3 Left keys (
  • Shift, Control, Option
  • ) then press and hold the power button.
  • Release
  • Turn on the Macbook Pro

To Reset the PRAM
  • Turn on the Macbook Pro
  • Immediately press and hold
  • option command p r
  • Wait for the computer to chime 3 times, or with some newer models, hold for at least 30 seconds or if you can see the apple logo appear on your screen 3 times.
  • Release the keys and let the computer start

Throughout various versios of MacOS and OS X, these 2 resets solved anywhere from 50%-90% of the issues that plagued Macs that I've dealt with over the years  .
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Mr.XAuthor Commented:
ok thanks will give it a try.
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