I noticed my forum was getting slower but it is not just my forum.
On similarweb I took a look at my forum and found that on September 13th I was getting 110k views I climbed slowly to 260k views on Jan 19th then things took a nose dive and by Feb 16th I was back to 120k views. All of my data is from Sep1 to Feb16
I sent a message to one of my admins and he shot back data on some other forums. He showed me 7 other forums that went into rapid decline starting either Jan 19th or Jan 26th. The forum I looked at have ranged from losing 1/3 to 2/3 of their traffic. Out of the 7, 2 of them are starting to show mild recoveries starting on Feb 2nd while others have continued to drop.
I started checking random forums and I am finding this trend all over the place.
I looked at Xenforo and between Jan 19th and Feb 2nd it dropped from 190K to 100K then bottomed out and is having a modest recovery.