at 400 transactions in web wallet, the loading page takes a while.

On wallet.atto.cash, at transaction 400, I notice that once you open the wallet, it'll actually prepopulate the whole list for you, which may not be practical once we get up to 1000 transactions or more. 

I'm not sure if this is possible, but it could also slow down the PC?

(reported in discord, mentioning it here for bug tracking)