Bug fixes.
Since this was just a bug fix release it seems likely the cause is actually something else. If you go back to a previous release is the issue still there? That would confirm the problem is not this release.
I did try but it said as the project had been opened in the most recent build, I couldn't open it in the previous? I'm rolling with it for now, hoping future updates fix it. Nothing else has changed in terms of weird CPU spiking when using the event system dialogue boxes. Super strange! Any ways, thanks!
Please bear in mind that in general, issues will not be investigated unless they are filed to the tracker following all the guidelines.