I recently came across a new platform while browsing, and I was surprised by how smooth and fast the overall experience feels compared to others I've tried before, especially in terms of loading speed and usability —
https://dados.unifei.edu.br/user/n6666
https://cs4001.cc.gatech.edu/members/dpd777/
https://demo.mycred.me/members/jiliplay9965/activity/