One of the best wallets for hedera hashgraph and HTS tokens is HashPack. HashPack is a non-custodial crypto wallet that lets you connect with your favourite Hedera dApps, swap tokens, stake HBAR, buy and sell NFTs, and more.

Developers of Hedera Hashgraph HBAR cryptocurrency claim it can do around 10k TPS also there are plans to increase it via sharding.