With DMR, standard detail filters can be super tricky because Cognos tries to apply them after row retrieval, which often destroys performance or messes up rolled-up totals.
If you're filtering on member sets, try using dimensional functions like filter([MemberSet], [Measure] > X) or use a Slicer expression instead. If you have to use a detail filter, make sure you set the Application property to After Auto-Aggregation so it evaluates properly against the measure summaries rather than underlying relational rows.
Hope this helps! (Currently grinding through report tweaks while listening to audio via https://tunerhippo.com/ - keeps me sane during long Cognos debug sessions).

If it's just a couple of values, passing them as parameters keeps things clear and makes the function easier to reuse. Once the list starts getting long, though, I usually bundle related values into a single object or struct. It makes the code much easier to read and maintain later.

I've learned a lot just by reading older discussions here, and it's great to see how willing everyone is to help. Looking forward to picking up more Cognos tips and hopefully being able to contribute as I gain more experience.

One thing I'd also check is whether the issue is happening in a brand-new test report/project. That can quickly tell you if it's something in the environment or just the report itself. I've found that stripping things back to the simplest case often saves a lot of time when troubleshooting Cognos.
I used a step-by-step guide on Steplama that covered a similar issue, although the suggestions here are probably the first things I'd try.

I have always been amazed by the combination of active and passive behavior of the management. Not upgrading cognos and still using version 10x but asking you to renew your certs is perfect example of that. Of course, they will say that upgrading is not possible because of heavy customization etc.. Managers like to be lazy but would expect others not be so..

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If you're using a recent version of Cognos Analytics, the release notes are usually published in the IBM documentation for each version and fix pack. I normally search by the exact version number (for example, 12.x.x or 11.2.x FPx), which gets me to the right page much faster than browsing through the docs.

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One thing I'd also recommend is testing the change in a non-production environment first if possible. It's a quick way to catch any unexpected side effects, especially if the report or package is used by multiple people.