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Today,I am login to m1.codeforces.com to look up the judge status of last div.3. When I log in, it reminds me "**Please wait.Your browser is being checked.It may take a few seconds**" and can not enter the contest interface. So,what's up with it? 
UPD1：I tried to use mobile phone with another network to log in.The same as it is.
UPD2: I changed another browser(360) and it works.
Auto comment: topic has been updated by Sparrow_Guo (previous revision, new revision, compare).
Same, I was trying to participate in Div3 from it, but it kept showing this
it works well after i close my vpn
I do not use vpn when I log in.....
Auto comment: topic has been updated by Sparrow_Guo (previous revision, new revision, compare).
How long did you wait?
(I measured that it takes about 1 minute and 20 seconds to get past this screen)
(UX improvement: add a static spinner to that page and it's massively improved)
At least 10 minutes when the notice appear for several times.I tried to refresh the page to reload.However,it changed to a blank page after refresh.....