Thanks John for your answer, and sorry for not answering for so long... 
I've been occupied by other things, and I've had to postpone my "learn 
Racket" ambitions a bit... 
Anyway, time for a fresh start... 

Am 08.09.2020 um 22:08 schrieb John Clements: 
Can you be more specific? Are there particular programs that you can point 
to? I think the solution to your problem is going to depend a bit on the 
kind of slowdowns that you’re seeing. 

I was just referring to how long it takes in DrRacket to evaluate an 
apparently simple program. Something like 

``` 
(+ 1 1) 
``` 

It takes about 3-4 seconds to run that. 

Simply adding a the #lang declaration makes the whole thing much faster... 

``` 
#lang racket 
(+ 1 1) 
``` 

Actually, it looks really similar to the problems described here (
https://stackoverflow.com/questions/37508535/excruciatingly-slow-over-ten-seconds-for-1-1-with-language-how-to-des)
 
and here (https://github.com/racket/drracket/issues/281). 

Best, 
Denis 

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