Since you are pulling directly from a server's file system, download speeds are often capped only by your own connection.
It is easier to see a list of 500 games at once rather than clicking through individual pages. The Role of Preservation and Emulation Index Of Games Iso
A non-profit library that hosts millions of pieces of software. It is the most "official" and safest place to find ISOs for historical purposes. Since you are pulling directly from a server's