SSD will not make much difference. rA is loaded into memory, and disk IO is no longer much of a factor after that (except for database read/writes).
CPU and memory are more important. You have only 1 core, this can slow things down if you are running multiple processes on your VPS. 1GB memory is a bit on the low side too, as rA will consume over 500MB of RAM on loading.
If you want to run on a VPS, bump it up to 2 cores and 2GB of RAM. Should help a bit.
rayn's post in Unknown Packet 0x464d even after Skip Packet Obfuscation was marked as the answer