It's quite likely your controllers are doing too much stuff.
Your controllers really only aught to be
If they do more, you probably should be refactoring logic out of your controller. Note how if you have a broad "service" later injected into your controller, you only need to mock the one thing
Another possibility is your end to end tests are too exhaustive. Google for Martin Fowler's test pyramid, the number of e2es should be small. Test the key business cases and then unit test everything else. This should give you enough confidence your system works and keeps your test suite from taking a long time to execute.
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