Very High CPU after upgrade from Yosemite

[yoelca]

I am getting a new MBP with yosemite, and upgrade directly to El capitan. After upgrade, I find out the fan is quite noise, and CPU is very high.

I found out it is all the system process in high CPU, including launchd, UserEventAgent, ... Anyone has similar experience? any hint?

I did not do TM backup yet, and I can not get the Yosemite download from App Store. Any way to move back to Yosemite?

Thanks,

 

[beebarb]

How recent was your upgrade?
It can take a few hours for the new install to 'balance out' as it were.

Initial installs or upgrades will have a period of reduced performance, and high activity, while system and application caches are rebuilt, and search indexes are updated.

 

[yoelca]

How recent was your upgrade?
It can take a few hours for the new install to 'balance out' as it were.

Initial installs or upgrades will have a period of reduced performance, and high activity, while system and application caches are rebuilt, and search indexes are updated.

I just upgraded last night. I may wait a few hours more to check any improvement. Thanks for the info.

 

[Shirasaki]

If your Mac comes with Yosemite, things are easier since you can use internet recovery to bring Yosemite back.

If not, then you may need to download Yosemite from elsewhere, or find the true download link to download Yosemite from Apple server.

 

[SRLMJ23]

You have to give the system time to do all its background tasks, especially Spotlight when it is Indexing. Sometimes it can take a couple days of solid use for your system to get flyin' again! Do not worry, your system will come around...no need to go back down to Yosemite.

If for some reason, after say 3-5 days, or one week max your system is still acting up then I would say something might have gone wrong during installation and you I would recommend you do a clean install of El Capitan.

In my opinion it is always better to do a fresh install of a new version of OS X. You might consider that, as well.