Delay in receiving emails with IDLE in Rust compared to Node.js

[mikap0703]

I’m rewriting a Node.js program in Rust that listens for new emails using the IMAP IDLE command and reacts to incoming messages. However, after implementing the same behavior in Rust, I noticed a significant delay in email reception compared to the Node.js version.

The Node.js application receives emails almost instantly, while the Rust implementation lags behind by 20-30 seconds. Both applications:

• Use the same email account for sending and receiving
• Utilize the IDLE mechanism to wait for new emails
• Are tested under the same conditions (same mail server, same network)

I'm using rust-imap 3.0.0-alpha.15

Any insights or similar experiences would be appreciated!

[jonhoo]

Hmm, I don't have an immediate answer to why that might be. There isn't really any delays in the library itself. Best suggestion I can give is to try and add some prints/breakpoints in imap and see where the program is spending its time after Node has been notified but before Rust has.