Site VERY slow when logged in1 user found helpful
Old page versions can also slow a site down, so run the core cleanup job repeatedly or extreme clean - but make a backup first, just in case.
In number of pages, my site is tiny: about 15 pages across 2 levels, so I don't think the autonav would be affecting performance. But how might I set the autonav to not expand all pages?
If your site is really simple then you probably don't need a workhorse like Concrete5 or any other "big" CMS to power it. If you're interested in switching you might look at a smaller CMS like Perch or a hosted CMS like Squarespace. All have pros and cons.
And of course, no CMS is going to overcome a slow host or unoptimized code and file structures, so you might look into where the bottlenecks really are (I have no idea, just throwing out possibilities).
At this point, I'm leaning toward your suggestion of migrating to a different CMS (although we can't afford commercial ones like Perch). I'm thinking about Joomla, mainly because I'm familiar with it and past experience has shown it to run fine on even GoDaddy shared hosting. Any other ideas for free CMSs that run fine on low-budget hosting plans?
Looking in a different direction, sometimes performance is more to do with how busy your are or who you are sharing the server with.
Not only on login but just visiting the site is pretty slow for my liking.