This asks the website if there is anything new. It uses your cached (saved) data for images and layout to load quickly.
Many people obsessively press F5 on their desktop to "make the computer run faster." This is actually a myth! It doesn't speed up the processor; it simply redraws the icons. Use it when a file is missing or an icon looks wrong, but you don't need to spam it. refresh shortcut windows
If you are pressing F5 and nothing is happening, check two things: This asks the website if there is anything new