The Mac version of AppGameKit Classic slowed down after version 2018-07-12 ( retina issue? ). In the later versions you can copy the Geany bin files across to restore the speed but Paul says this breaks certain mobile exports due to API changes. Paul also said he doesn't know where the issue is which is fair enough as he didn't code the API of the IDE.
I can confirm that AppGameKit Studio doesn't have this issue on Mac and the IDE flies along. However the issue still remains in Studio as it does with Classic that the non synced FPS has been reduced by hundreds of FPS in subsequent versions of AGK. Some of us have reported this issue but as far as I can see there has been no official response to it as all resources are set on Studio. There also remains a vSync bug as also reported by myself and others but again I think these issues are on hold until Studio is out the door.
I can understand priorities being put into a new product but I hope these old issues are addressed soon as they have been present for almost a year now. Many won't have noticed it but for those who develop and keep an eye on FPS usage certain do notice that 2018-07-12 is faster than the latest versions of classic and studio ( Including FPS run in Studio ).
*edit* - Just to clarify, none of these issues are show stoppers and the new Studio IDE is a huge leap forward and a joy to use. It's like discovering AppGameKit all over again with a pro IDE. For those still on Classic go buy AppGameKit Studio as the more that do buy it the more guarantee we have that AppGameKit gets better and better.