Can someone tell why this happens everytime i fix a morph after face editing

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Can someone tell why this happens everytime i fix a morph after face editing
pmx help!!!
Okay so, I reset my computer and redownloaded MMD and PMX,
but whenever I use/open PMX, it lags everything!!! It never did this before even before I reset my computer.
What’s wrong with it?? What do I do to fix it?