test: fix flaky test-performance-eventloopdelay #3045

Job	Run time
Build slim tarball	1m 37s
aarch64-darwin: with shared libraries	2h 21m 50s
x86_64-linux: with shared libraries	2h 6m 27s
x86_64-darwin: with shared libraries	1h 23m 4s
aarch64-linux: with shared libraries	1h 29m 30s
	7h 22m 28s

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