i'm not looking at an evolution screen right now, but there may be several things that might help...
-perhaps you could recompile it to be optimized for your particular computer (notebook?).
-maybe you can set your default view to day or week, if it is set to month. perhaps it will load less data that way...
-make recurring appointments using that setting, minimizing the amount of individual entries when possible (maybe recurring appts take up less space, than the sum entered individually?).
-make sure you have the most recent version. newer versions may be more efficient at things like not loading old data unless it is requested, and RAM usage.
-make a request to the dev team. they are likely aware of the problem, but each request helps to identify the problem as more "urgent"
just some ideas to get you started. also make sure to google for the answer, as others may have some clever solutions.