Make RUBY_MIME_TYPES_LAZY_LOAD the default

[halostatue]

Although loading the MIME type registry is fairly fast, do not force people to pay that cost up front. Implement ENV['RUBY_MIME_TYPES_LAZY_LOAD'] as the default behaviour and provide a new variable (ENV['RUBY_MIME_TYPES_IMMEDIATE_LOAD']) to fall back to the old behaviour.

[halostatue]

This would be fairly useful, but there is not much of a definable benefit to this as a default. I will do further investigation on this, but I think that I am more likely to look at removing the lazy load functionality entirely for mime-types 4.x because of the columnar capabilities added in 2.6 and improved in 3.0.

[grosser]

came here because I noticed 0.3s of my boot time going into mime-types :(

used this flag and ran 1 test each ... only showing 0.1s gain, but that might be because the files are hot/cached at this point, so not sure about the real gain but it is a step in the right direction ..

RUBY_MIME_TYPES_LAZY_LOAD=true
runs: 10
total: 53.86
average: 5.39
range: 5.27..5.82

without:
runs: 10
total: 54.48
average: 5.45
range: 5.35..5.54

[halostatue]

You should also look at using require: 'mime/types/columnar' in your Gemfile since you appear to be stuck on 2.99.x, which will do a different form of lazy loading (columnar, so you get fast lookups for minimal data). The other advantage on this is that it will drop the memory of use MIME::Types by about 1/3. I am trying to get rest-client to loosen the MIME::Types version they require so that MIME::Types 3 can be used (it allows for independent updating of the data file), and the zendesk_api should probably do the same.

[grosser]

that would be awesome :)

On Thu, May 12, 2016 at 10:19 PM, Austin Ziegler notifications@github.com
wrote:

You should also look at using require: 'mime/types/columnar' in your
Gemfile since you appear to be stuck on 2.99.x, which will do a
different form of lazy loading (columnar, so you get fast lookups for
minimal data). The other advantage on this is that it will drop the memory
of use MIME::Types by about 1/3. I am trying to get rest-client to loosen
the MIME::Types version they require so that MIME::Types 3 can be used (it
allows for independent updating of the data file), and the zendesk_api
should probably do the same.

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#62 (comment)

[halostatue]

As previously discussed: this is being deprecated. Some testing suggests that it has no effective impact compared to the columnar loading that is the default version in v3.