[ruby-core:101148] [Ruby master Bug#17335] load gem in ruby 2.6.6 extremely slow

Issue #17335 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Feedback to Third Party's Issue

paulHu (paul hu) wrote in #note-4:
> could someone please have a look at this?

From your own analysis, the problem seems to be in tk.  I can replicate your issue:

```
$ time ruby -rsequel -rtk -e '1' 
    0m02.37s real     0m00.34s user     0m00.08s system
$ time ruby -rtk -rsequel -e '1' 
    0m09.37s real     0m00.19s user     0m00.08s system
```

However, tk is not in the standard library in any supported version of Ruby.  You should file an issue in the ruby-tk bug tracker: https://github.com/ruby/tk/pulls

The simplest workaround would be to require tk after all other libraries.

----------------------------------------
Bug #17335: load gem in ruby 2.6.6 extremely slow
https://bugs.ruby-lang.org/issues/17335#change-88833

* Author: paulHu (paul hu)
* Status: Third Party's Issue
* Priority: Normal
* ruby -v: ruby 2.6.6p146 (2020-03-31 revision 67876) [x64-mingw32]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
my ruby app starts up extremely slow after I upgrade from ruby version 2.3.1 to  2.7.2. My app does load quite some gems (using "require") at startup.  Following code would take 29 secs on my windows 10 PC.

puts Time.now.to_s + ' require starts'
require 'net/ssh'
require 'tk'
require 'tkextlib/tile'
require 'thread'
require 'json'
require 'io/console'
require 'csv'

require 'tkextlib/tcllib/plotchart'
require 'tkextlib/tktable'
require 'socket'
require 'tkextlib/tcllib.rb'

require 'rubyXL'
require 'rubyXL/convenience_methods'

puts Time.now.to_s + ' require ends'



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