Admin suddenly slow

So I upgraded to Version 160801 this morning and ever since, when logging in as admin it is cripplingly slow.
Before this it took maybe a second for pages to load but now I am looking at anywhere between 5 and 10 seconds…

Normal users can view the site at normal speeds, but when logged in as admin everything is slow, but the admin panel is very very slow…

Anyone have this or think they can help?

Nothing else on my site has changed.

I tell a lie, wordfence is the culprit, did not spot it had updated and it was that causing the problem.

Please feel free to close/delete this.