Going into Black Ops 6 they have expanded there server options and added more places in which you can ping to in regards to matches meaning lower ping for more players which means better performance.

North America

Atlanta

Chicago

Columbus

Dallas

Los Angeles

Miami

Portland

Salt Lake City

San Francisco

Washington

South America CoD MW3 Servers

Sao Paulo

Santiago

Africa 

Cape Town

Europe CoD MW3 Server Locations

Amsterdam

Helsinki

London

Madrid

Moscow

Paris

Asia Call of Duty Servers

Bahrain

Hong Kong

Riyadh

Seoul

Singapore

Toyko

Australia CoD Servers

Sydney

Each of these spots hosts a dedicated server for nearby players. Everyone in the surrounding region is competing here. This can mean those right by these cities get the best connections to the Activision servers.