If you feel up to editing json directly, the reject list is also visible under FFF config, Other tab, View library preferences, rejects_data. If you are running Calibre in debug mode, you can edit settings directly.
However, that's an 'off label' use of a development/debug feature. I'm not going to do much to support you with it.
How many entries do you have in your reject list? I have 2000+ and I believe I tested it to several thousand...
If you're on Windows, I highly recommend using Calibre 64bit, not 32bit. It can use a lot more memory.
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