We have quite a similar problem here (4.4.5/4.1.1). The CKEditor toolbars show up after quite some time of loading, maybe 1-2 minutes. And loading is taking a lot of processor resources. So, our take is a javascript/ajax error or misconfiguration.
After the toolbar shows up, we’re able editing pages as usual for maybe an hour or so. During this timespan we’re even able to log out, close the browser, emtpy the browser cache, login and edit again hassle-free.
Thereafter, the conundrum repeats …
