Photon, a startup that helps developers build AI agents, has secured $4.5 million in funding to support the growth of its platform, which enables agents to work across various messaging platforms, including iMessage, SMS/RCS, and email, potentially replacing the need for mobile apps.

The Rust compiler can be sped up by disabling the `--enable-rustc-bootstrapped` feature, enabling the `--incremental` feature, and using the `--cache` option, as suggested by Austin Appleby, a developer who has contributed to the Rust compiler. Additionally, using the `--bap` option can speed up compilation by reducing the number of passes required. However, the options and their effectiveness may vary depending on the specific use case and system configuration. It's also worth noting that the author has seen significant speedup on his own machine by disabling the `--enable-rustc-bootstrapped` and enabling the `--incremental` feature, although the exact speedup is not specified. The article provides more detailed information and code examples for implementing these speedup techniques.