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Never mentioned if 13 or 15, I'm using a late 2013 15", still almost as smooth as the day i bought it. You're...worrying too much...

I am using 13
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Why would it make it slow?

The theory is, according to some, that Apple inadvertently sometimes makes devices slow with software updates and some people then have to upgrade. Happened to iphones in the past i think.
 
I have a mid-2011 13" MBA. 1.7GHz i5, 4GB RAM, 256GB SATA SSD.

Sierra runs like a champ for me. I'd say faster than El Capitan as well.

Worst comes to worst, you can always TM backup your Mac, throw Sierra on it, and if you don't like it, go back to El Capitan and restore from that TM backup.

BL.
 
Same machine as the OP - Had problems with El Cap, so stuck with Mavs until now.
Sierra runs fine. One or two minor glitches, but my big apps (Photoshop/Lightroom/Illustrator) run great.
 
Should I upgrade? El cap is running fine... am worried
Only you can decide.

I wanted the new features (iCloud desktop/documents, Siri, Apple Watch unlock, etc.). Working perfectly. I made sure all the applications I use were fully supported with Sierra.

We can't guarantee you wont have some kind of issue weird, but I've been 100% satisfied.
 
The theory is, according to some, that Apple inadvertently sometimes makes devices slow with software updates and some people then have to upgrade. Happened to iphones in the past i think.

No. Apple doesn't "make devices slow with software updates."

Newer software is more demanding than older software. Older hardware sometimes can't perform the task as well as newer, faster hardware.

Should I upgrade? El cap is running fine... am worried

It's fine. Sierra, so far, seems to just be a bit of polish to El Cap.
 
I am using 13
[doublepost=1478544746][/doublepost]

The theory is, according to some, that Apple inadvertently sometimes makes devices slow with software updates and some people then have to upgrade. Happened to iphones in the past i think.

Was it this person who told you?
 

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