Slowness and sometimes “the window is not responding” error message

Is this the same as the Joplin Server? (I could maybe install it on my Synology NAS)

My large amount of data comes up often. I think the first thing to do is to reduce that, as I talked about here.

I'm also reading posts talking about plugins that can slow down Joplin, and I have quite a few:

My Plugins

Backup: 1.4.0
Bidirectional Links: 0.1.2
Favorites: 1.3.2
History Panel: 1.0.2
Joplin DDDot: 0.4.2
Menu items, Shortcuts, Toolbar icons: 1.1.0
Note list and sidebar toggle buttons: 1.0.3
Note overview: 1.7.1
Note Tabs: 1.4.0
Outline: 1.5.13
Quick Links: 1.3.2
Reset Checkboxes: 1.0.1
Rich Markdown: 0.14.1