DRIVERS-2581 : Goal: Improve performance of In-Use Encryption for the workload identified in HELP-27047. Proposed changes for drivers: Benchmark throughput of decrypting documents with many (e.g. 1500) encrypted fields. The benchmark is specified here: https://github.com/mongodb/specifications/commit/db3114e957f7c0976a1af09882dbb46cb4a70049 Attempt to use fields of `mongocrypt_binary_t` to avoid calls to `mongocrypt_binary_data` and `mongocrypt_binary_len`. The fields are exported as of MONGOCRYPT-589 . Expect an improvement in throughput. Refer to the changes made for the Java driver bindings: Benchmark added in: https://github.com/mongodb/libmongocrypt/pull/690 Use of `mongocrypt_binary_t` fields done in: https://github.com/mongodb/libmongocrypt/pull/693 The benchmark may be useful for testing future performance improvements ( DRIVERS-2718 ). Proposed changes may not benefit languages with no extra cost for calling into a C library: (C, C++, PHP via C driver) or drivers that are not using the crypto callbacks (Go).