GoDaddy's CPanel has a real-time RAM/CPU performance tracker. I basically loaded several views all at once (hit reload on multiple browsers) while adding a new item to a CPT. It spiked around 400MB of RAM.
It's not a very intensive site. You can see it here:
phoebefoxauthor.com
There are three Views: the slider on the home page, the Books page (which drill down to CPT "Book" with content templates), and the Media page (two versions of the same view, different taxonomy filter).
I've built far more complex sites than this and never had a problem. I also tried deactivating a bunch of plugins besides Types/Views and those didn't really make a dent into the resource usage.
Here is the debug info per page:
Home:
Page info
Current page hidden link
Total memory used 3.2506MB
Render time 0.76
Total MySQL queries 39
CPU usage 4.86%
Elements info
- Blurbs Slider (Review Blurbs ordered by post title, ascending, 1 item per page with automatic AJAX)
ID 11
Name Blurbs Slider (Edit)
Kind of element View
Render time 0.08119
Memory used 0.1567MB
Summary Review Blurbs ordered by post title, ascending, 1 item per page with automatic AJAX
MySQL query Show
Items found 1
Books:
Page info
Current page hidden link
Total memory used 3.3044MB
Render time 1.48
Total MySQL queries 42
CPU usage 4.53%
Elements info
- Book Index - Grid (Books ordered by post date, ascending)
ID 295
Name Book Index - Grid (Edit)
Kind of element View
Render time 0.38671
Memory used 0.2088MB
Summary Books ordered by post date, ascending
MySQL query Show
Items found 4
Media:
Page info
Current page hidden link
Total memory used 3.4876MB
Render time 2.22
Total MySQL queries 91
CPU usage 4.61%
Elements info
- Table Media Links - Reviews & Interviews (Media Blurbs ordered by Field - modified, descending)
ID 309
Name Table Media Links - Reviews & Interviews (Edit)
Kind of element View
Render time 1.10035
Memory used 0.3633MB
Summary Media Blurbs ordered by Field - modified, descending
MySQL query Show
Items found 33
+ View Loop
- Table Media Links - Articles & Essays (Media Blurbs ordered by post date, descending)
ID 223
Name Table Media Links - Articles & Essays (Edit)
Kind of element View
Render time 0.10544
Memory used 0.0244MB
Summary Media Blurbs ordered by post date, descending
MySQL query Show
Items found 4
+ View Loop