Comcast (NASDAQ:CMCSA) has increased Internet speeds for customers in most of its residential service areas in California, as well as certain markets in Kansas, Missouri and Texas.

Comcast has increased the speeds of three Xfinity Internet tiers: "Performance" now offers speeds up to 50 Mbps, up from 25 Mbps; "Blast" is now 105 Mbps, up from 50 Mbps; and "Extreme 105" has been bumped to 150 Mbps.

The changes impact most California customers (except those in Santa Cruz, Los Gatos, Scotts Valley, Isleton, Lodi and Rio Vista), as well as those in the Olathe, KS; Independence, MO; and Houston markets.