Found other ones: December 24 where egress was much higher then ingress (but crypto-workers were pegged, not main thread). December 28 & 29, attack like today. Feburary 1 & 2, like today with ingress higher than egress.
In today's and the latter-two above the main event thread was pegged either continuously or intermittently with ingress higher than egress.
Just looked again and see all threads, crypto-worker and main-event pegging episodically.