MIT Scheme Company Mode is Sluggish

Hello

I tested company mode for Racket and MIT Scheme. The latter is unusable at all: e.g. when I type (de) Emacs freezes for few seconds, then the autocomplete menu appears.

Racket works smoothly. Any ideas why it happens?

Emacs: 26.3 under macOS

MIT-Scheme (via Brew): Release 10.1.10 || Microcode 15.3 || Runtime 15.7 || SF 4.41 || CREF 2.6 || LIAR/svm1 4.118

Geiser: 0.11.2

Thanks, Slava