On my Mac (Mojave 10.14.6), I had disabled the indexing and git status line, but still got an enormous number of scan: ... lines and CPU usage, even when none of the open files referenced a git repo.
I eventually shutdown ST3 (build 3207 BTW), ran rm "${HOME}/Library/Application Support/Sublime Text 3/Local/*.sublime_session".
On restarting the problem has gone away. I suspect that ST3 crashed at some point and left behind references to the .git repos that caused the problem.
Iāve been using Sublime for years and love it, but lately performance issues are making my MacBook completely unusable.
Iāve read through this topic and tried various suggestionsā¦
Iāve tried setting show_git_status and gpu_window_buffer to false.
Iāve deleted the session.
Iām on 3.2.1 / 3207, on macOS 10.14.6 (18G84).
Every time I save any file, it rebuilds the entire project index from scratch - is that how itās supposed to work?
I can wait for the indexing to finish (several minutes), but as soon as I save a file, it starts again. If I donāt wait for it to finish, it starts again. Itās always indexing! Given how much CPU that consumes, I canāt get anything else done.
At the moment, I have no alternative except to disable indexing, which is a shame as āgotoā is really handy.
Any ideas?
Latest Sublime. MacOS catalina, iMac 2018 16gb ram. 1tb ssd.
Sublime consumes over 100% memory.
Could you check the sublime indexing status: Help>Indexing Statusā¦, as well as try reverting to a freshly installed state.
Just installed Sublime 3.2.2 for the first time ever. Iāve never used it before, but I like what I see, at least for the first minute or so. Now itās spiking my CPU and is almost unusable. Tried https://www.sublimetext.com/docs/3/revert.html but no luck. Also, checked indexing status and its āidleā. Iām on macOS 10.15.4. 
Trying to figure out what youāre referencing. I see that question being asked a lot in this thread, but as I am new to Sublime, I havenāt yet found the document on how to produce what youāre asking for.
The Sublime console is a panel that you can open at the bottom of the window that shows status messages from Sublime, your plugins, etc. You can get at it by using View > Show Console from the menu or using the key binding thatās displayed there (or via the panel chooser menu in the bottom left of the window).
Ah, of course. MacOS now lists Sublime as āusing significant energyā, but at least the fan hasnāt started running this time. It was non-stop last time. Not sure whatās different this time. Iāll keep using it and if it happens again Iāll capture the console right away. For now, hopefully something below helpsā¦
Thanks!
using gpu buffer for window
environment variables loaded using: /bin/bash -l
scan: /Users/sean/Documents/Development/powrslide-qt/target/PowrSlide.app/Contents/MacOS/PyQt5/uic has been seen before, skipping (using inode) previous path: /Users/sean/Documents/Development/powrslide-qt/target/PowrSlide.app/Contents/Resources/PyQt5/uic inode: 8673107416
scan: /Users/sean/Documents/Development/powrslide-qt/target/PowrSlide.app/Contents/MacOS/PyQt5/Qt/translations has been seen before, skipping (using inode) previous path: /Users/sean/Documents/Development/powrslide-qt/target/PowrSlide.app/Contents/Resources/PyQt5/Qt/translations inode: 8673107424
reloading plugin Default.arithmetic
reloading plugin Default.auto_indent_tag
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reloading plugin Default.copy_path
reloading plugin Default.detect_indentation
reloading plugin Default.echo
reloading plugin Default.exec
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reloading plugin Default.font
reloading plugin Default.goto_line
reloading plugin Default.history_list
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Package Control: Skipping automatic upgrade, last run at 2020-05-12 20:33:31, next run at 2020-05-12 21:33:31 or after
I have not up upgraded, using sublime 3 for many months, no new extensions/addons installed but all of a sudden there is a spike rendering it useless.
The indexing will parse all of the code in any folders you have open, which can take a while when you first open a folder, especially if the folder contains many thousands of files.
Future releases of Sublime Text will have some improvements to the performance of indexing, which should minimize this.
The other thing that can consume a lot of CPU is if you open a large folder with many filesystem events happening. For instance, if you open your user home folder, Sublime Text gets filesystem notifications about every file creation, modification and deletion. With a home folder, this can be quite a lot of activity.
If you are using Package Control a new version of a package may have been installed. The way to test would be to see if https://www.sublimetext.com/docs/3/revert.html helps.