http2 slowdown

I have an AJAX search one one of my systems that does a search as you type. When using standard connections (via non SSL) the speed is nice and fast. However, with http2 on SSL it runs about 3-4 times slower. Any ideas? It's almost as if the server is delaying the response on purpose possibly due to flood control? I'm using an AJAX abort to cancel the previous ajax request. Could it be with http2 an abort request doesn't actually work with http2?