[plt-scheme] drscheme/mred memory use

Hi,

I notice that DrScheme likes RAM.  Right now 'top' says it is using  
411 MB of private resident memory.  (Not sure what the difference is  
between RPRVT and RSIZE in top.)  Is this something about the  
DrScheme in particular, or is it something caused by the MrEd GUI  
toolkit?  I ask because I'm looking at ways to write GUI apps with  
PLT, so I'm wondering if using MrEd to build a fairly complex GUI  
leads inevitably to that level of memory usage.

thanks,
Rob