I've come to accept that Media Composer is a little slow. It can't keep up with me. I'm a fast editor. But I always get ahead of my own keystrokes. I'll make an insert edit, and I have to wait anywhere between .5-2 seconds before the edit happens.

Does this happen for you? In Final Cut, Resolve, or Premiere, this is not an issue.

I wonder if it has to do with the project being hosted on shared storage. I'm using an Avid-certified computer. A Lenovo P710 with a Quaddro M4000. 

The footage is 1080p23.98. 

There is nothing terribly taxing about the work I'm doing. 

The project is also pretty small. 

Any thoughts on this? 

Media files storage?

The storage is a 10Gb connection to a Studio Network Solutions 8-bay EVO with Avid bin-locking emulation. 

it varies for me by release, but 2018.12.3  has been super snappy and responsive for me. 

This may sound a little crazy, but are you using USB or PS2 keyboard and Mouse?

Wireless keyboard with the receiver plugged into a USB port. No mouse. Wired Wacom tablet. 

I have no latency with typing or other keystrokes in the OS.