Good for you, I'm experiencing the exact same issues as the parent comment. Tweets don't load taking multiple refreshes to load, on mobile I get an error every 2nd or 3rd request. Notifications definitely are not popping up anymore and when I click on the tab I do see them but then the next refresh they disappear. Sometimes completely failing to load.
It's not completely broken but I've been definitely experiencing a degradation the past 5-7 days.
One effect of a service degradation like you are describing is that people will hit Reload more often when things appear broken, further increasing the load. This can quickly lead to a cascade failure at a tipping point.
It's not completely broken but I've been definitely experiencing a degradation the past 5-7 days.