The power saving feature appeared in version 9.4.1 for macOS. You can enable it in the settings. When activated, Telegram disables auto-playback of videos and GIFs, some interface animations and other energy-intensive functions. As a result, the application consumes less hardware resources and energy.
The power saving mode can be customized for yourself. For example, disable only autoplay video. You can even ask the system to activate the mode only at a specific battery level.
Although the feature is targeted at MacBooks, Apple desktop users can also take advantage of the new power-saving mode to make Telegram faster. This is true for older models with weak hardware.
The update also contains bug fixes and performance improvements.
It is worth noting that two different Telegram applications are available for Apple users: the native version for macOS in question, and Telegram Desktop, a universal application available on macOS, Windows and Linux. Don't mix it up.