The fishing system was polished, its so weird that it works laggy for you.
I will suggest just trying other ways to advance the game, like foraging or mining!
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if you mean the board in the guild then it seems all of the locations are locked I didn't even know its purpose I'd assumed it was gonna unlock after getting to a certain part of the story but after getting as far as I'm currently able to into the main storyline buying everything from the quintuplets talking to everyone I could think of doing all the side quests (except the one I need fish for) and borderline interrogating jimmy I just assumed that it wasn't implemented yet but if it is then maybe there's an issue with the save or my device since the fishing lag is also apparently a me only thing so idk I guess I'll just take the L