The P-26 was a first generation monoplane fighter; in 1941, it was past its best used-by date. It actually preceded the Gladiator into service
With a top speed of 230 MPH give or take most of the biplane fighters of the mid-1930s were faster than the P-26. The Gloster Gladiator I had a listed top speed of 253 MPH.
The Japanese Army's biplane Ki-10, which didn't even fly until 1935, had a similar top speed to the Gladiator, but also had surprising stats in its climb rate 1000 m/s (3,280 ft/sec) and service ceiling, 11,500 meters (37,730 ft). That service ceiling is higher than any of Japan's mass-produced fighters of World War II.