What model Amazon should choose for cockroach db?

Start a robot every 50ms. The robot adopts the following behaviors. Each robot will add 10 friends with the id in the back. After the first team agrees, they will conduct team matching, and then 4 people will conduct individual matching, and then the remaining 7 people will go to the mode of creating and joining the room.
When there are 1000 users, it is found that the cpu pressure is very high, 500%, and the delay of nakama statistics is 4000ms. May I ask what model Amazon should choose for cockroach db? I chose t2.2xlarge 8-core 32g memory before.