It should be faster:
That’s according to this post stating the Titan’s CPU:
Complete benchmark comparison:
https://www.cpubenchmark.net/compare/5300vs3567/Intel-i3-1315U-vs-Intel-i7-10710U
The amount of RAM has no influence on the speed of RoonOS. However, for the million tracks you probably have to add memory to the Titan. I don’t think you need 64 but 32 are well possible. If you don’t have enough RAM, it will crash, so this would be obvious (but it won’t get slower because of it)