I came across another implementation of R called FastR. It claims to improve R performance to a great degree. I am curious if anyone has tried it and how it feels.
Last I've heard, they were hard at work to make dplyr and data.table work which means that they don't work yet 
. Depending on your workflow, it might be a deal-breaker.
Also, Oracle doesn't have the best reputation, so whenever there are discussions of GraalVM (where this FastR implementation supposed to work), there are always quite a few people that don't touch it on principle, so again, depending on your convictions, that can be a deal-breaker too.
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