In Dolphin > Configure > General > Previews, there is an option for "Skip previews for remote files above", where the user can specify a size limit. However it seems like the minimum increment (and therefore the minimum size) is 1MiB, which in my opinion is insufficient precision for many remote connections. I for example own several VPSes on another continent over not-so-fast connections, so I actually want to set this value to something like 50KiB. But currently this is not possible, at least not on the GUI. It's either 1MiB or no previews at all. Ideally these dialogs can accept arbitrary units. Maybe have two fields instead of one (first accepts a number, second accepts a unit)?
And in case anyone else comes across this need before it's fixed, the corresponding config entry is `MaximumRemoteSize` in `~/.config/kdeglobals`. You can edit this value in the file directly and it does seem to work, but it will be reset to 0 the next time you change any dolphin configurations graphically.