Poor tremolo rendering in 4.4

I have a score that uses tremolo on the tympani part to indicate a roll. This sounds great when I originally used version 4.3. I tried the new version and now the part sounds like someone is banging out straight 32 notes. I get the same poor quality on tremolos used on string parts. I reverted back to 4.3 and now the tremolo parts are rendered as expected.