I think your regex takes too long because it tries to match the parameter as first part again and fails (not sure if this is possible, depends on where the regex continues after a match has happened, I'm a little rusty on that part of the regex lore and too lazy to look it up). But to fail it has to search through to the end of the file until it can be sure it failed, because of the evil "s" parameter on your regex, so that ".*" means rest of file instead of just rest of line.
How to correct that depends. Maybe you can change the "__" in front of the parameter to something else. Or it might make sense to split on "__", then work on the array piece by piece, avoiding the g parameter on your regex. Or change the global matching to happen in a loop and make sure the matching starts after the parameter
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