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With many particle emitters open, perf tanks. Cascade is ticking even if the editor tab is not visible/active, which can cause all sorts of performance issues. Cascade ticks through engine tick, so the only way to properly avoid this is to check for ticking of the viewport widget; added a flag to it to keep track of ticking in the last frame, then checking and clearing that in the Cascade tick function. #codreview nick.atamas dave.ratti [CL 2523454 by Olaf Piesche in Main branch]