After much playing around i figured out what the problem is with cover caching. With cover buffer set to default (20), the problem boils down to one simple thing.. THEMES.
With the default theme and no default.ini, the cover cache loading problem is nearly non existent, as soon as the default.ini is present WiiFlow can barely cache 10-15 covers at least for me. The good news is though that some themes don't have a problem.
I haven't been able to test all the themes yet, but here are the following results for cover caching per theme.
8-Bit Playground-m=Good Cover Caching
Andro!d=Good Cover Caching
BlackWii=Dumps with r884, no longer works w/latest WF
Carbonik-Abz=Good Cover Caching
Carbonik-M=Good cover caching
Default w/ini=Bad cover caching
Default no .ini=Good Cover Caching
Multiflow=Bad Cover Caching
Starnight=Good Cover Caching
EDIT: Need to test:
Blue Carbon, Luigi's Mansion, Violet-m, Carbonik colors(red,purple, etc.), WhiteWii, Greennv, DarkUmbra, Orchid-m and Subspace. If there are any themes I missed anyone is aware of please let me know. I'll be back with more results tonight or tomorrow.
I've only tested caching emu covers not Wii covers and really the only real problem here is the DEFAULT.INI NOT WORKING TO CACHE COVERS. Why is it that other themes such as fledge68's and Abz cache with no issues? WiiFlow should work right out of the box w/o any themes necessary. Hope this helps.