WP Super Cache OR W3 Total Cache NOT WORKING

Neither plugin seems to be working right and I have done everything within my capabilities to fix both. Super cache gives me white pages every other reload, despite all php syntax showing up correctly and w3 total cache takes FOREVER to run, there’s the longest lag time ever. I have tried to optimize both plugins and still, neither is working. I need SOMETHING. I currently use a CDN.

Is there any alternative to those two plugins that I could utilize? Please help.