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Hi just visited your site, it loaded fairly quickly with my 3mb download connection. That percentage does seem a little high, and depending on the number of sites sharing and the traffic to those sites the amount of ram could be fairly low too.
A better indicator would be the server load. High CPU cycles will slow a connection dramatically. Memory, depending on the operating system and actual load, can be freed to load more data automatically, so the figures in some ways could be misleading.
I just recently switched host due to high serverloads, and site load times in excess of 2 minutes. Sometimes hosting companies will put too many sites on one server instead of adding another to even the load. One high volume of miconfigured site could cause problems for the rest also. But such is the life of shared (and cheap) hosting.
My new host had some delay in setting up my account, which worried me until the explained they were adding a new server for my site. Been very happy since then.
Here is an example of what my server is currently running at:
Server Load 0.05 (1 cpu)
Memory Used 33.8 %
Swap 0.992 %
Good luck, any continual problems contact your host for resolution. Most will like very much to keep you happy.