Ok Im on an HTC Desire V and I ran into this cumbersome issue with my stock messaging app, I have a thread having a little above 4700 texts. The stock app JUST WONT OPEN this thread. What actually happens is if I try opening that thread, I can see a rotating loading icon and it does not go away. After this I am unable to open any other conversation either.
I have been using ChompSMS just for fun and it was quite convenient, more customizable but it still was quite laggy.
I have just installed GoSMS and it seems to be smoother with its default settings or minimal customization.
I would personally recommend GOSms if you:
1. Happen to have conversations having large number of texts
2. Want to customize appearance of your sms app
3. Can afford ads/ little annoyances while using your sms app
Its a good app, since they are giving it for free, you may choose to live with the ads etc
GoodLuck!