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NCrunch possibly causes autocomplete delay in VS2026
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davetorutek
#1 Posted : Friday, March 20, 2026 12:25:38 AM(UTC)
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In large projects in VS2026 the built in autocomplete (and the ctrl-. refactor menu) have delays of multiple seconds.
I disabled ncrunch and restarted VS and I couldn't get it to occur, I then enabled ncrunch (without restarting and after restarting) and it immediately came back.

There is a VS thread here about general autocomplete delay in VS2026, in 18.4 GA the situation improved for most people, but not me.
I tried disabling ncrunch to test it and that seemed to resolve it.

I can only spend so much time using VS without ncrunch, but I used it long enough I feel like ncrunch is partially responsible at least. (The issue recurs quickly with ncrunch installed)

My settings:
12 cores VS, 20 cores ncrunch.
20 background threads + fastlane.
Optimise for fastest test execution.
Parallel: yes
RDI: Disabled
Execution mode: only impacted tests

Issue does not occur with VS2022.

Let me know what I can do to help debug this, I could privately share the codebase if really necessary.

Thanks!
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Remco
#2 Posted : Friday, March 20, 2026 4:22:34 AM(UTC)
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Thanks for sharing this issue.

NCrunch doesn't have any integration with this area of VS, so if you're experiencing a correlation between NCrunch being enabled and this seeming to take longer, the problem is almost certain to be resource related rather than a software performance issue.

The first thing I would check is whether you experience the same behaviour when VS is set to use ALL cores on the system. One of the problems with the continued development of VS on newer hardware is that MS size the IDE to make full use of available machine resources, which tends to cause problems for background processing tools like NCrunch that need to compete for resources. It's possible you may need to re-evaluate your balance of resources between VS and NCrunch for your current setup, or consider offloading to a grid node.
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1 user thanked Remco for this useful post.
davetorutek on 3/22/2026(UTC)
davetorutek
#3 Posted : Sunday, March 22, 2026 9:38:40 PM(UTC)
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Thanks, other users are experiencing it without NCrunch.
For me I could only reproduce when ncrunch was enabled (reproducing is very random, so this was probably just a coincidence).
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