To reduce speed compilation you can disable all default features (I'll probably disable all feature by default in future) and, to reduce the binary size, change some `profile.release` config.

Tests for the example I shared yesterday:

Default features and default release profile:

* compilation time: 43 secs

* cdylib size: 479kb

* staticlib size: 58Mb

Without default features but with default release profile:

* compilation time: 31 secs

* cdylib size: 479kb

* staticlib size: 49Mb

Without default features and with LTO enabled, codegen-units set to 1 and abort on panic (but still optimized for performance instead of size):

* compilation time: 35 secs

* cdylib size: 437kb

* staticlib size: 12Mb

Same as above but optimized for size (not aggressive):

* compilation time: 30 secs

* cdylib size: 427kb

* staticlib size: 9.5Mb

I not plan to write a sync version of the SDK, also if very very basic. But I can try to reduce the above values as much as possible.