[FR] Could you please support the local cache function?

[sherlcok314159]

When the number of memos is large, the time for loading the memos is getting longer. When some memos consist of images, things get worse. When you load the images, scroll the screen and return to the top. The images need to be reloaded. It is kind of annoying.

I think it is better to save already loaded data in the local. It can reduce the loading time and make memos with images more friendly. Please add this as an option for us. Thanks for your contribution.