[Feature Request] Preview features

The program itself is good and convenient. But to make a .gif, I need to know the final size or reach the target size.

• Would like to see the size of the current project immediately, not just after export.
• Sometimes it's impossible to achieve the desired size just by removing extra frames; in that case, I'm ready to lower the image quality - but that will also only be visible after export. Would like to see a preview. How changing the palette or other modes affects it.