For short spurts. If almost every allied fighter (Including British) caught it flying below 400 mph then it couldn't accelerate fast enough to avoid being destroyed. It rarely flew over 500 mph except for a combat closing on a bomber.
It Germany handn't started the war, they would have had the metals to make a jim dandy bird. Instead, as the war dragged on, the materials to make a world class engine went down the tubes and they had to use inferior metals on the turbines.
Funny, two Germans were attributed to inventing the concept of the swept wing in 1935 yet in 1934 and American presented pretty much the same thing.
We all forget Robert T Jones and give credit to the Germans. And I question if the Germans came up with the original idea for the jet engine at all. For the centrifugal jet engine I would give that to Frank Whittle (1928. So you now will counter with the axial flow. Okay, but in 1937, German Scientists were given a tour of Lockheed who had the proposed Axial Flow engine on display. I propose that Germany stole both engines and called it their own inventions.
Back to the swept wing. Most gives the Germans credit for the swept wing in 1935 yet in 1912,
Burgess-Dunne tailless biplane was already flying. And let's not forget the Russians in the middle 1930s and the Italians as early as 1922. These weren't just concepts, they were fully functional flying aircraft.
In some ways, war accelerated the aircraft but in other ways it stifled some. In the Burgess-Dunne case, they first flew theirs in 1912 but was gearing up for mass production in 1913 to release the new models in 1914. And well all know what happened in 1914. Then WWII put a damper on the Lockheed Axial Flow because the DOW forced them to just make more P-38s and Cargo Planes because they thought the axial flow was a silly idea.
I keep seeing Germany making claims for the jet engines, swept wings and a host of other things when all they really did was put someone elses invention into an application out of desperation.