Bench compilation time of nanoserde and serde

Benching scenario - read tiled tilemap from json and than serialize some binary data for networking messages. This is based on the real project migrated from serde to nanoserde.

Benches are just single runs on quite old machine(x230 with i5-3230M).

If build-time dependencies optimisation level is not specified in test - they was in default state (no profile.release.build-override section in Cargo.toml).

Debug build, json only

> cargo build --features "tiled-nanoserde"
..
Finished dev [unoptimized + debuginfo] target(s) in 3.90s

> cargo build --features "tiled-serde"
..
Finished dev [unoptimized + debuginfo] target(s) in 29.47s

Nanoserde: 4s   
Serde: 30s

Release wasm build, json only

> cargo build --features "tiled-nanoserde" --release --target wasm32-unknown-unknown
..
Finished release [optimized] target(s) in 6.80s

> cargo build --features "tiled-serde" --release --target wasm32-unknown-unknown
..
Finished release [optimized] target(s) in 58.02s

Nanoserde: 7s Serde: 58s

Wasm filesize, json only

# nanoserde
> wasm-strip target/wasm32-unknown-unknown/release/nanoserde-bench.wasm
> du -sh target/wasm32-unknown-unknown/release/nanoserde-bench.wasm
156K

# serde
> wasm-strip target/wasm32-unknown-unknown/release/nanoserde-bench.wasm
> du -sh target/wasm32-unknown-unknown/release/nanoserde-bench.wasm

212K

Debug build, json + bin

> cargo build --features "tiled-nanoserde, nano-bin"
Finished dev [unoptimized + debuginfo] target(s) in 4.10s

> cargo build --features "tiled-serde, serde-bin"
Finished dev [unoptimized + debuginfo] target(s) in 30.40s

nanoserde: 4s serde: 30s

Release wasm build, json + bin, without [profile.release.build-override] opt-level = 0

> cargo build --features "tiled-nanoserde, nano-bin" --target wasm32-unknown-unknown --release
Finished release [optimized] target(s) in 6.32s

> cargo build --features "tiled-serde, serde-bin" --target wasm32-unknown-unknown --release
Finished release [optimized] target(s) in 59.35s

nanoserde: 6s serde: 59s

Release wasm build, json + bin, with [profile.release.build-override] opt-level = 0

> cargo build --features "tiled-nanoserde, nano-bin" --target wasm32-unknown-unknown --release
Finished release [optimized] target(s) in 5.69s

> cargo build --features "tiled-serde, serde-bin" --target wasm32-unknown-unknown --release
Finished release [optimized] target(s) in 32.91s

nanoserde: 6s serde: 33s

Wasm filesize, json+bin

# nanoserde
> wasm-strip target/wasm32-unknown-unknown/release/nanoserde-bench.wasm
> target/wasm32-unknown-unknown/release/nanoserde-bench.wasm
160K

# serde
> wasm-strip target/wasm32-unknown-unknown/release/nanoserde-bench.wasm
> target/wasm32-unknown-unknown/release/nanoserde-bench.wasm
216K

Incremental debug build time, json+bin

> cargo run --features "tiled-nanoserde, nano-bin"
Finished dev [unoptimized + debuginfo] target(s) in 0.36s

> cargo run --features "tiled-serde, serde-bin"
Finished dev [unoptimized + debuginfo] target(s) in 1.65s

nanoserde: 0.4s serde: 1.6s