In case you use google/apiclient package to connect to Google API services, remember to cleaning unused services after deploying to production.

So let me show you why

First, lets counting number of classes of Google API services inside composer autoload classmap file (Composer use this file as a mapping to lazyload your needed class)

$ cat vendor/composer/autoload_classmap.php | grep 'Google' | wc -l
15436
$ du -h vendor/composer/autoload_classmap.php
3.5M vendor/composer/autoload_classmap.php

As you can see, it has almost 15k classes having Google in class namespace. And your autoload_classmap.php has 3.5Mb in size (so large)

So, let cleaning unused services (by keeping only services you need)

Editing your composer.json file by adding "pre-autoload-dump" in scripts and "google/apiclient-services" in extra, like below (replace services you need like Drive, Youtube, Sheets, etc..)

{
"scripts": {
"pre-autoload-dump": "Google\\Task\\Composer::cleanup"
},
"extra": {
"google/apiclient-services": [
"Drive",
"YouTube",
"Sheets"
]
}
}

Finally, run composer dump-autoload again and see the result

$ cat vendor/composer/autoload_classmap.php | grep 'Google' | wc -l
383
$ du -m vendor/composer/autoload_classmap.php
1.3M vendor/composer/autoload_classmap.php

Class map reduce from 15k to 400 lines, and size from 3.5M to 1.3M ! Such an optimize !

Beware : If you add services after cleaning, try to run rm -r vendor/google/apiclient-services && composer update to redownloading all services classes.