my wordpress dashboard is running really slow. sometimes it takes more than couple of minutes to load. I have noticed that "ADD NEW POST" page is more slow than any other parts. I do not have that much plugins installed, only few seo plugins.
and from today, when i upload new images it doesnot show image size options(large, medium, thumbnail). it only says large size(0x0).
i haven't made any changes in the media settings, all settings are good.
can anyone suggest what's the problem?