I'm on macOS 10.2.2 with ample (16GB) RAM and a SSD. Might the problem be related to macOS? PDFPenPro and Preview are working fine with the same documents.(I'm a very heavy Skim user and have been for years.)
PDFpen 10.2.2
Download: https://miimms.com/2vBmGX
2ff7e9595c
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