For this release we completely refactored low-level implementation of http handling. Finally uvloop gives performance improvement. Overall performance improvement should be around 70-90% compared to 1.x version.We took opportunity to refactor long standing api design problems across whole package. Client exceptions handling has been cleaned up and now much more straight forward. Client payload management simplified and allows to extend with any custom type. Client connection pool implementation has been redesigned as well, now there is no need for actively releasing response objects, aiohttp handles connection release automatically.