My experience using the lib. Inputs for performance improvement #105

First of all, Thanks for this amazing library.

I am using this library and would like to share experience that will give you data when you refactor code to improve performance

• When $openapi object is initialised by reading spec file it is taking significant time that can be reduced ($openapi = Reader::readFromJsonFile(realpath('openapi_spec.json'));)
• When I print_r a Schema object (cebe\openapi\spec\Schema) it takes a lot of time, browser crashes sometimes. (Workaround print_r property directly echo $schema->title)
• Above issue also occurs when I try to print other object such as MediaType
• php.ini: max_execution_time & memory_limit are needed to increase. If possible, changes can be made to be within limit of PHP defaults

Note: I have not done concrete profiling. This are just my primary observation while using the lib

I will share further experiences when I go come across any