@snow It is a little large, but not so bad -- as it encoded to a jpeg. Normally it seems to use a .PNG format to images dropped into the Toot Editor via copy/paste.

I download yours and recompressed with Riot plugin, 80% quality factor, and came to 239 KB.

I normally will process an image locally before using it on Mastodon, unless it's a quick screenshot or other one time use one (not to be seen by many people possibly).