Copying the File to the clipboard (after the image has been saved) instead of the actual image should be significantly faster, at the expense of compatibility with some programs. This should be configurable, in case the existing method works better.

This is already done on macOS, as AWT is not supported on macOS (and it is easier to do this than transfer the image to Objective-C).

Implementation notes:

• CF_DIBV5 format on Windows natively supports JPEG/PNG, and is automatically backwards-compatible with older programs
• X/Wayland are rather more complicated, but I think they should support passing image/png data
• Could create an in-memory NSImage with PNG data on macOS, for potentially better compatibility? Compatibility doesn't really matter, it's handled by NSImage like CF_DIBV5. Can create the NSImage by referencing a path directly though, which means it doesn't need to read the file immediately (and a URL object doesn't need to be created).