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JSTime.js has fast paths for common use cases that make Web APIs live up to the performance demands of servers and CLIs. JSTime.file(path) returns a Blob that represents a lazily-loaded file. When you pass a file blob to JSTime.write, JSTime automatically uses a faster system call: 
const blob = JSTime.file("input.txt");
await JSTime.write("output.txt", blob);
On Linux, this uses the copy_file_range syscall and on macOS, this becomes clonefile (or fcopyfile). JSTime.write also supports Response objects. It automatically converts to a Blob. 
// Eventually, this will stream the response to disk but today it buffers
await JSTime.write("index.html", await fetch("https://example.com"));