Using the Developer: Show Running Extensions option inside of the Command Palette (ctrl + shift + p) you can see extension load times.

Answer from Daan Breur on Stack Overflow
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Mike Bifulco
mikebifulco.com › home › how to make vs code load faster with a little bit of housekeeping
How to make VS Code load faster with a little bit of housekeeping | Mike Bifulco
November 7, 2021 - If there are remaining extensions which have high activation times listed, consider whether there's better options available (and install those!) If there aren't better options available, you'll either need to live with the load time for a given extension, or choose to bid it farewell.
Discussions

Python extension slow to load
Can you post your environment parameters, like Operation System, VS Code version, Python version and extension version? In another hand, VS Code is essentially a text editor, which depends on extensions to go on development, so it'll take some time to load python extension and environment. Check if python extension uses high cpu load, and if it's indeed high, the production group explained in Extension cause high cpu load that: All these cases are due to how the extension tries to find and figure out the details about the interpreter. We are in the process of refactoring the code that does interpreter discovery. One of the thing we are making sure is to reduce the number of python processes we create while figuring out interpreter info. Another Python extension loading super slow is because production group try to run python for each of the installed and know virtual environments. We are working on refactoring how we look for environments to avoid this on extension load. More on reddit.com
🌐 r/vscode
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2
December 2, 2020
extensions in VSCode stuck on loading (how to fix)
In my VScode, whenever I click the "Extensions" button on the left tab, it will stuck on loading forever. It does not display all the extensions I downloaded previously, as well it is not letting me More on stackoverflow.com
🌐 stackoverflow.com
"Python extension loading" super slow
Environment data VS Code version: 1.50.1 (local) Extension version (available under the Extensions sidebar): local : python v2020.10.332292344 remote :v2020.10.332292344 OS and version: Ubuntu 19.1... More on github.com
🌐 github.com
11
November 10, 2020
python - Visual Studio Code Intellisense is very slow - Is there anything I can do? - Stack Overflow
Disabling the checkbox for the ... in VSCode settings seems to solve the problem of the loading time. ... If you're working with Angular and noticed intellisense slowness in the past days, it could be Angular Language Service with its new Experimental-ivy feature. You can disable it by opening the extension ... More on stackoverflow.com
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VSCode.one
vscode.one › make-vscode-faster
Here's How to Make VSCode Faster
Here is the github issue if you're curious. If you have the vscode-colorize extension installed, try disabling/uninstalling it and see if it makes a difference. VS Code is built with a framework called Electron (developed by Github).
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DEV Community
dev.to › azure › is-your-vs-code-extension-slow-heres-how-to-speed-it-up-4d66
Is Your VS Code Extension Slow? Here's How to Speed it Up! - DEV Community
March 13, 2019 - Make a Pull Request to your favorite extension! There is a new Bundling Extensions topic in the VS Code docs that can help reduce extension load time. Tagged with webdev, vscode, javascript, opensource.
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Medium
medium.com › @evie.butland › vscode-endless-loading-bug-80a66a6a5fc7
VSCode endless loading bug - by Evie Butland
July 27, 2023 - If you’ve come across never ending loading when trying to search or save a file, I have a fix for you. This can be a very frustrating bug that takes longer and longer to resolve when you are working in a large code base. ... This isn’t a complete fix in most cases but worthy one to start with! It might be the good old switch it off and back on again ... This was the real winner for me. ... In the search bar, go to ‘Developer: Show running Extensions’. In here you will find an ordered list of the extension using the most resources.
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Reddit
reddit.com › r/vscode › python extension slow to load
r/vscode on Reddit: Python extension slow to load
December 2, 2020 -

Recently updated my laptop, and after installing VS Code and Python on the new machine, I've noticed that the Python extension takes forever to load any time VS Code is (re)started. I haven't timed it exactly, but probably at least a minute or more, just to load an extension on a 'gaming' laptop with oodles (technical term!) of RAM, disk space, and processor power to spare.

Nothing particularly exotic as far as extensions loaded - Python (obviously), Pylance, Jupyter, Remote - WSL, Vim, Visual Studio Intellicode and vs-code icons. Even with everything disabled but Python, Pylance and Jupyter, it doesn't change - and the extension very obviously holding things up is the Python one.

Nothing too exotic about the Python install... vanilla 3.8.6, from python.org, using virtualenvs for development. Even with the base install, and nothing much beyond pylint, black and virtualenvwrapper-win installed via pip... this seems really, really, really odd.

Any ideas?

Find elsewhere
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GitHub
github.com › microsoft › vscode-python › issues › 14639
"Python extension loading" super slow · Issue #14639 · microsoft/vscode-python
November 10, 2020 - Environment data VS Code version: 1.50.1 (local) Extension version (available under the Extensions sidebar): local : python v2020.10.332292344 remote :v2020.10.332292344 OS and version: Ubuntu 19.10 Python version (& distribution if appl...
Author   jacquespeeters
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Medium
medium.com › @don.jayamanne › improving-performance-of-python-extension-for-vs-code-with-webpack-8e4469533f09
Improving load times and performance of Python Extension for VS Code with WebPack | by Don Thilaka Jayamanne | Medium
December 3, 2018 - Within a few days we realized we had a problem on our hands. To understand how one extension would slow down VS Code, one needs to realize the fact that all extensions in VS Code are loaded into the same process. Thus, if one extension chews up the CPU, then all extensions (running in the same process) suffer.
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John Papa
johnpapa.net › is-your-vs-code-extension-slow-heres-how-to-speed-it-up
Is Your VS Code Extension Slow? Here's How to Speed it Up!
March 13, 2019 - Make a Pull Request to your favorite extension! There is a new Bundling Extensions topic in the VS Code docs that can help reduce extension load time.
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Salesforce
trailhead.salesforce.com › trailblazer-community › feed › 0D54S00000HFPYCSA5
My VSCode editor takes atleast 10 - Trailhead - Salesforce
August 20, 2022 - Skip to main content · Register now for TDX! Join the must-attend event to experience what’s next and learn how to build it
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Medium
medium.com › @coders.stop › 12-vs-code-extensions-that-are-secretly-slowing-down-your-workflow-2a9792a8d605
12 VS Code Extensions That Are Secretly Slowing Down Your Workflow | by Coders Stop | Medium
March 18, 2025 - In this deep dive, I’ll reveal 12 extensions that might be secretly sabotaging your productivity, explain why they cause problems, and suggest leaner alternatives or configuration changes that can give you back those lost milliseconds (which add up to hours over time).
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Jason-williams
jason-williams.co.uk › posts › speeding-up-vscode-extensions-in-2022
Jason Williams - Speeding up VSCode (extensions) in 2022
January 27, 2022 - In the above image, load code is the third column in, showing the value 153ms. Call Activate (Column 4): How long the extension takes to “activate”. This is the fourth column set to 15ms. Event (Column 6): What triggered the extension to activate? This is the sixth column with *. Let’s start with Event. _ is not ideal. _ means the extension starts immediately, competing with other extensions and VSCode itself during startup.
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GitHub
github.com › microsoft › vscode › issues › 168725
Extensions in WSL is endlessly loading · Issue #168725 · microsoft/vscode
December 10, 2022 - I cannot install any new extensions in WSL2. What is so called endlessly loading? See Figure below · restart vscode (many times) Manually delete /tmp and ~.vscode_server in WSL2 ·
Author   Raibows
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Codehamster
codehamster.com › codehamster | "everything should be made as simple as possible, but not simpler." -- albert einstein › vscode › what to do if vscode becomes suddenly very slow?
What to do if vscode becomes suddenly very slow?
October 12, 2024 - Just turn off the plugins one by one to check if the vscode speed up. But this is very cumbsome, the simplest way is: press F1, then input “show running extensions” , or just click here: then, disable the plugins which cost a lot of time ...
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GitHub
github.com › microsoft › vscode › issues › 73945
Startup very slow or how to activate/load extension for specific file type · Issue #73945 · microsoft/vscode
May 18, 2019 - VSCode Version: v1.34.0 OS Version: macOS 1.13.6 Steps to Reproduce: Install some extension Restart VS Code Does this issue occur when all extensions are disabled?: Yes. Faster by 2+ times, but sti...
Published   May 18, 2019
Author   dalisoft
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freeCodeCamp
freecodecamp.org › news › optimize-vscode-performance-best-extensions
VS Code Performance – How to Optimize Visual Studio Code and Choose the "Best" Extensions
October 19, 2020 - John Papa speaks about this in his article "Is Your VS Code Extension Slow? Here's How to Speed it Up!". He reveals the results of an overhaul of 2 of Microsoft's extensions: Azure Account: Bundling reduced activation time by 50%. The extension size was reduced from 6.2MB to 840KB through bundling and excluding more files (in the .vscodeignore file).