Rust example is an order of magnitude slower than wasmtime binary

[tomasol]

time wasmtime markdown.wasm --invoke render "# Hello"
warning: using `--invoke` with a function that takes arguments is experimental and may break in the future
warning: using `--invoke` with a function that returns values is experimental and may break in the future
<h1>Hello</h1>


real    0m0.041s
user    0m0.039s
sys     0m0.005s

Rust:

time ./target/release/markdown 
Loaded in 475 ms
Rendered <h1>Hello, Rust!</h1>
 in 1 ms

real    0m0.484s
user    0m1.674s
sys     0m0.040s

I have added a stopwatch around load_file and render method. What could be the issue?

[tomasol]

Passing --disable-cache to wasmtime binary only accounts for 100-150ms:

time wasmtime --disable-cache ./pkg/markdown.wasm --invoke render "# hello"
warning: using `--invoke` with a function that takes arguments is experimental and may break in the future
warning: using `--invoke` with a function that returns values is experimental and may break in the future
<h1>hello</h1>


real    0m0.161s
user    0m0.431s
sys     0m0.024s

[alexcrichton]

I'm going to now that we've temporarily removed interface types support, but stay tuned to bytecodealliance/wasmtime#677 for future updates!