No way to delete conversations

Theres no reason that deleting entire conversations shouldnt be an option. The app starts slowing down after a while and you need to delete the app and reinstall to remove old messages. Theres no way to delete so the app gets bogged down. When trying to text someone, the app cannot handle texting speeds once bogged down and slows to a crawl, typing each letter in slowly after youve already finished typing. The PC version lets you delete conversations. Why this was overlooked on an app is beyond me. Fix it please. Until then, only 2 stars. The app is unusable once it slows to this point.
Also: App randomly is not able to send messages.

DatNameDoh about Pushbullet