>>1901321Found the issue. All of your opacity masks were causing the weird lines to appear. It actually does appear in Illustrator as you zoom in and out at specific moments. I released all the opacity masks and used the Alt-click+Minus Front on the fills to make them Compound Shapes instead. This fixed the issue. I can't tell you why the opacity masks caused it, but use compound shapes instead for the rest of the image.
Here are a couple other things to note. When working with large source images, it is best to unembed the image to reduce filesize. Click the original image in Illustrator, click the gold text of the file name at the top left and click "Relink." Then, find the image in your file directory and double click to have it link to the file. This will reduce the filesize from 38MB to 12MB. If you need to give the file to someone, then you just put the Ai file and original image in a folder and ZIP it so the link is maintained. You can go one step further and do "Save As" and uncheck "Create PDF Compatible File," which will reduce the filesize to about 1MB. Unchecking the PDF compatibility means you can't open it in anything but Illustrator, but you can always do "Save As" again when you're done to check it back on. Doing those two things should make the file run better, and reduce the time significantly when saving.
Here is the file with the changes made:
https://my.mixtape.moe/sugflo.zip 