Operating system:MacOS Mojave 10.14.5, Kubuntu 18.04
Graphics card:Intel Iris 550 on Mac, Nvidia 1070 on linux
Broken: 2.82 ba1e9ae4733a but also ealrier versions of 2.81 like ed779333bb82
Short description of error
playback of alembics with deforming geometry is at least 4-5 times slower an various systems.
Exact steps for others to reproduce the error
attached a simple blend file (abc would have been to big to attach), export as an alembic and try playback in 2.79 or 2.80 compared to newer 2.81 builds or 2.82 alpha. Sorry if it's a duplicate, didn't see it reported though.