Speed hasn't really been an issue with any of the providers I've tried except Loggly which has a very slow UI if you run into big messages. Even with ingesting 200gb of logs a day at one job, per environment, Sumo wasn't slow that I recall.

Of course, we didn't try to negotiate, but it looks more expensive than Sumo. At one company we were spending around $600k a year on it, and it looks like you would cost closer to 1m.