There is also a performance issue with the default Cessna 152 and Cessna 152 Aerobat since SU4, but no one seems to care about it. I’m using the WBSim and JPLogistics Cessna 152 now and this one works fine, except that it is (a little bit too) tricky to start the engine from cold and dark, but this can be experienced as realistic for some. 
Hi @PascalKuykx ,
I have created this topic for you since the one you originally posted in is related to a different issue. If you can provide steps to replicate this issue and some users can confirm it, feel free to create a report (using the template) in the Bug Reporting Hub . Thank you !
What kind of performance issue?
I mean the speed and climb performance of the aircraft. The static engine RPM is also questionable or poorly simulated. I’ll create a more detailed report later today because I dont have the time right now.
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Ok I checked. The WBSim mod falls within what it should be. The default is over by quite a bit.