There's still room for improvement the team is already aware of this concern so they will adjust accordingly, the lag issue might be from the connections
or from the mobile device, base on observations, there's no issue if you use computer while using mobile device you experienced issue, lets wait for the team to update what current actions they are doing to solve this.
In reality, no matter the real issues come from gamers' Internet connections or from Rocket site, their team done their works great to improve their users' experience with the version for mobile (browser, by now, not apps). And, after that, I think the team have help their gamers a lot with better playing time, without or at least less lag issues. Let's see more feedback next few weeks.