On my M8 my test app would lag because I don't like to delete messages or photos in the text messages. I switched to TEXTRA in the app store and I haven't looked back at the HTC stock messaging app. Thing is that Textra accepts comments to improve the app. The coolest function I thought they had was that your data would automatically turn on in order to send a group or MMS message. However, Google killed the API for it. Who wants to toggle data on/off when the app can turn it on to send, then turn it off right after. Dang you Google.
Try out Textra everyone.