Timeout sending messages when users subscribed are a lot

When the number of users subscribed to the bot starts to be high (1000+), message delivery takes a lot of time (more than 2 minutes), causing an error 524 (timeout between the original server and CloudFlare).

This is my suggestion: when a new message is going to be sent and the users subscribed to the bot are exceeding a certain number, the plugin should automatically split the list in multiple chunks (for example 200 each), sending the messages asynchronously using those chunks. In this way each task is way faster and the server don’t need to wait too much for a response.