There is a particular person I chat a lot with on whatsapp and now this particular conversation lags a lot when I open it. Sometimes take up to 30 seconds to just open the conversation while other conversations can open immediately.

I have tried to delete the conversation so many times but whatsapp will hang and crash after 5 minutes or so. Is there any way to remove this conversation? I want to keep my other chat rooms and conversations on going.

If I reinstall the whole app, will my other chats be deleted?

Yea I've backup my important chat history and just reinstalled whatsapp. My chat groups are all still there but no chat history at all. Lucky thing back up already.

Only thing now, last time I downloaded whatsapp a long time ago via appstore and that time it was free for iPhone users as long as we downloaded it either for free during promotion or paid download. Now I understand they charge 99cents/year after the first year. Any idea if I now need to pay 99cents each year or will my account be the same as last time?

Just checked. Mine stated "lifetime". This means I do not have to pay 99cents every year right?
Thanks

When I first got it, the fonts were so big I thought the phone is trying to say I'm old.

Prefer using the smallest font. But a lot of other things on the phone also very small font now.

Yes, mine very lag as well. It's getting really annoying. I hope they fix it ASAP.