Ugh, why is Visio always so terrible?

It's 2024 and every time I launch Visio and try to work on a single project, it takes a hot minute to load, and often freezes up and crashes, even on 64-bit and with 16GB or RAM on a new desktop. I'm just trying to make a physical diagram of four server racks. What the heck is so hard about opening up several pictures on a screen with some text? I'll often have to save constantly or risk the program crashing and losing my changes. Very frustrating. I mean, I know I am using Visio templates from multiple locations, but even so, these are very small images, it shouldn't be rocket science to keep them on the screen. Of all the programs I've used in the past, Visio seems to be the worst/clunkiest.