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Showing content from https://github.com/ruby/irb/issues/43 below:

pasting in multiline irb is slow · Issue #43 · ruby/irb · GitHub

Tried to paste a 31-lines snippet to compare a specific benchmark (anon module's #inspect was incredibly slow in < 2.7.0).

What I found is that 2.7.0's irb is unbearably slow to paste even these small snippet.

This is a comparison between Ruby 2.4.3 with pry 0.11.0 and Ruby 2.7.0-preview3 with irb 1.1.0:

https://youtu.be/c9ENYX8VVHA

I did some other tests:

1. ruby-2.4.3 with irb-0.9.6 and ruby-2.7.0-preview3 with irb-1.1.0 --legacy: absolutely instantaneous;
2. ruby-2.4.3 with pry-0.11.0: almost instantaneous (I assume parsing for syntax highlighting takes some time); watch video above;
3. ruby-2.7.0 with irb-1.1.0 and irb-1.2.0 (multiline mode): unbearably slow;

mmurphy-notarize, vieditcom, kaspergrubbe, ileri, devinford and 118 more

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