>>3781353
To load stuff from the cart to the console. I think Street Fighter Alpha 2 had like a 10 second load time between each match where the characters just stand there there while it loads.
>>3781353
Generally you see loading times when the cartridge had compressed graphics that it needed to decompress into VRAM.
Most games used some form of graphics compression, but some were using more complex compression algorithms which shrunk the compressed size smaller, but took more time to decompress.
Why didn't they just buy large enough memory chips for the carts to store it all decompressed? Larger chips for the carts significantly increased manufacturing costs for cartridges.
>>3781353
Heavy decompression of level, graphic, and music data.
Also these games were often cross-platform, meaning they were probably less than optimal in their assembly code.
>>3781353
There's a tiny CD-ROM inside every cartridge
>>3782092
I like this answer the most. I'm gonna go with this one.