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DENVER — If you’ve ever tried to use your phone downtown during a Rockies game, you’ve probably felt the need for speed.

Denver’s population keeps growing, but download and upload speeds are not keeping pace.

Denver is No. 18 in terms of population, but the Colorado capital came in last in a comparison of the 125 most-populated metro areas, according to a study by RootMetrics.

RootMetrics looked at overall performance, network reliability, network speed, data performance, call performance and text performance. Denver came in dead last in the speed rankings.

“All four carriers recorded median download speeds below 10.0 Mbps in Denver, and median upload speeds were even slower,” RootMetrics said.

“By comparison, the speediest city was Atlanta, where Verizon topped median download speeds at 33.3 mbps. Even there, T-Mobile saw a decline as well — down to 16.5 mbps from 26.2 mbps in August,” according to RootMetrics.

“Due in part to the slow speeds, Denver also ranked just No. 124 in data performance,” researchers said.

T-Mobile customers are dealing with the slowest speeds — and they actually got worse from the second half of 2015 to the first half of 2016.

T-Mobile’s median download speed decreased from 6.8 Mbps to 4.4 Mbps, researchers found. T-Mobile’s median upload speed decreased from 8.7 Mbps to 5.1 Mbps.

Researchers ranked Denver No. 84 for reliability, No. 87 for calls and No. 64 for texts. Sprint and Verizon were named the “winners” of the second half of 2015.

The top five metro areas for cellphone service are Lansing, Mich.; Indianapolis; Atlanta,; Milwaukee; and Chicago.