There has been a lot of posts on the official Brawl Stars subreddit lately regarding connection lag or animation delay. Earlier yesterday, Supercell released a message regarding this issue.
“The higher you are in your trophies there is a higher chance that you may be matched with players in another server which may cause lag/shot delay. We have added extra servers to alleviate the issue and is closely monitoring the situation.” – Brawl Stars developer team
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