Set to `True` for faster uploads and downloads from the Hub using `hf_transfer`.  
By default, `huggingface_hub` uses the Python-based `requests.get` and `requests.post` functions.
Although these are reliable and versatile,
they may not be the most efficient choice for machines with high bandwidth.
[`hf_transfer`](https://github.com/huggingface/hf_transfer) is a Rust-based package developed to
maximize the bandwidth used by dividing large files into smaller parts
and transferring them simultaneously using multiple threads.
This approach can potentially double the transfer speed.
To use `hf_transfer`:  
1. Specify the `hf_transfer` extra when installing `huggingface_hub`
(e.g. `pip install huggingface_hub[hf_transfer]`).
2. Set `HF_HUB_ENABLE_HF_TRANSFER=1` as an environment variable.  
Please note that using `hf_transfer` comes with certain limitations. Since it is not purely Python-based, debugging errors may be challenging. Additionally, `hf_transfer` lacks several user-friendly features such as resumable downloads and proxies. These omissions are intentional to maintain the simplicity and speed of the Rust logic. Consequently, `hf_transfer` is not enabled by default in `huggingface_hub`.