when uploaded 8/6/4K trivial images like(resistor color code, ... some informative image) that sometimes take up multiple posts, inconvenient to open them due to size and speed
high res. images good for teardowns, large/medium schematics, some complicated issue
most display can display 2K anyway
I use MS Paint to downsize photos, (original monochrome schematic JPG 9x6K 2.8MB) reduces size down to some 200KB and image size/resolution is still within 2K and readable