4 GB ram is definitely a massive bottleneck. If you stick 8 GB in that machine it will load things a lot faster, as 4 GB is horribly memory starved, and instead of just reading from disk, it will be paging things in memory out to disk at the same time to fit new stuff in.
Source: my own MBP 15"
16 GB is even better, but the big big jump is from 4 GB to 8 GB.
Won't do much for graphics speed though.
SSD will of course help loading times as well, but going from 4-8 GB is very cheap and well worth it.
thanks I got 8gb ram but now the problem is getting in my computer. Thank you.