The position of a laser is calculated on the server, not the client. The client should really calculate where the laser is (small scale), although it is still the server's job to calculate which table should be targeted.
@JustWannaFly is this something you would be willing to look into fixing?
Yes I can take a look at this.
I've got the lasers to a point where there is no change to how they behave but with the following optimizations
Does this take care of the performance concern or do we want to look at even further optimizations that would change the behavior slightly?
that would take care of the performace issues for networking, the targeting itself could also use some tweaks to be alot more efficient but i'll open another issue for that, feel free to PR this optimalization already
Should be implemented in 7.99.8: https://www.mod-buildcraft.com/buildcraft-7998-alpha.html.
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Yes I can take a look at this.