War accelerates implementation more than invention

Would technology advance as quickly if World War II ended in 1943?

Probably, and perhaps faster, because war redirects research toward making pre-war technologies practical rather than exploring a wider range of new ideas.

An early end to the war would not necessarily slow technology. Wartime systems are often rooted in research begun before the fighting. War changes priorities by concentrating effort on development, production, and practical use, while peacetime research can explore more uncertain ideas whose usefulness is still unknown. The proximity-fuse exchange supplies a concrete example: related concepts and mechanisms existed earlier, while the wartime advantage lay in successful implementation. The distinction is between the rate of invention and the speed with which a state turns existing concepts into usable equipment.