I have a system where we had on older model DataStation Plus just doing some minimal logging and it was fine. The plan was to give their operators remote access but there was red tape for them to get internet to that building. Six years later they finally did and wanted us to make it similar to their Panelview plus. So I replicated everything from the Panelview with its 400 or so tags. The old data station was quite slow via remote access through a VPN router. Meaning changing pages might take 5 seconds or entering a setpoint could take 5 seconds per character!
So I imported it to a newer DA30D and it blazes now.
I think the most extensive Crimson HMI I have is a Graphite with a shedload of logging, FTP sync and about 1200 tags. I see no performance issues with it.