Slow performance while clicking multiple paths in Illustrator CC 2018 and 2019 on OSX Mojave

Question

Hi!Clicking a construction in Illustrator CC (22 and 23) containing many paths takes multiple seconds before it is selected (until selected i see the multicolored, rotating ball in OSX). In CS6 this problem doesn't appear, the same object/group is selected just in time. It has nothing to do with GPU or CPU, i tried both modes, no change.Anyone has an idea what might be the reason for this?I'm using an iMac Retina 27" Model 2017, 4,2 GHz i7 with 32GB DDR4 RAM and a Radeon Pro 575 4 GB under Mojave 10.14.5.Andreas{Renamed by MOD}

chrisl41501719 · Answer

I've noticed this too and have a work around.

Select the paths and flatten transparency them. I know I know, it shouldn't do anything, but it does. Whatever is glitching that path often magically fixes itself when you flatten lines.

Pattern swatches, flattened files with bunches of embedded raster images, and complex transparencies all seem to cause an order of operations error. Meaning, I believe the fill information is calculated Prior to the clipping path(s). Therefore, for every shape with complexity (raster/pattern) the pattern/gradient/transparency is filled into the entire area - and only then - does it subtract what is outside the clipping path.

Think cookie cutters. The program rolls out the dough on the table. Then it cuts a cookie out. Then it rolls the dough out...

Instead, it should look at the clip first, then fill it. Which is what flatten transparency seems to fix.

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