Every time after i edited the raw file and Save For Web, the screen below takes awhile to finish loading. Although i have selected 50% in the circled areas but the selected value won't persist the next time i save for web again. Is there a way to configure Photoshop to save a smaller image size automatically each time i do Save For Web?

What about saving down to around 800px for, say, a blog... Or 720ish for Facebook? Anything changing that drastically 
