> On Feb 19, 2018, at 7:04 AM, 'Paulo Matos' via Racket Users 
> <racket-users@googlegroups.com> wrote:
> Hi,
> There was a time, many moons ago, not too far from the initial
> implementations of typed racked when Sam was working on it that moving
> from Racket to Typed Racket had a huge impact on performance.
> Nowadays that might not be the case. I also noticed that using typed
> racket might in itself improve performance (optimization coach seems to
> mention Typed-Racket specific optimizations).
> So, could anyone elaborate on their experiences to using typed racket
> nowadays with regards to performance? Can it still be a step backwards
> these days?

This characterization is still good: 

— fully typed programs might run significantly faster than untyped programs 
— the performance of partially typed programs is all over the map (10% slower 
to 10000% slower)
— it remains difficult to predict whether the conversion of a single module 
introduces a serious slowdown 
— slowdowns are caused by high frequency or large composite “crossings” of 
typed-untyped module boundaries 
        the allocation cost of wrappings of mutable and/or h-o values, and the 
wrappers themselves when these values are accessed. 

If you want more specific information, we can post a journal submission that 
compares several Racket implementations (6.2, 6.3, and 6.4) on a range of 
programs using functional to ho object-oriented style. 

— Matthias

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