The end_gateway beam is still rendered by the client after the beam has reached it's timelimit (10sec i think?)
you can easilly see this by standing in the end_gateway block: https://gyazo.com/b73a04a5a892cf288b015a5f57309cff https://gyazo.com/d940ab50230899aab8e1ae81b24b8ba8
while this may not seem like a big issue. if custom map creators want to build with this block (as it makes an awesome void/space texture) having alot of these blocks causes severe lag to the client.
i believe something needs to be done that will remove the beam entirely from the block after the 10 sec. (much like the beacon block, no supporting blocks, no beam)
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it's not that the beam is there. it's that it is rendered clientside by EVERY end_gateway block weather a player is standing on it or not.
imagine 5000 end_gateway blocks all with beacon effects running. that's alot of calculations for a client that DON'T need to happen.

A new beam is created after the time limit is reached. The end gateway continuously tries to teleport you.

what does that have to do with the beam being rendered at all times?
after the 10 sec the beam shouldn't exist unless the player is standing in the block (like a pressure plate being activated)

then show us images/a video of the beam rendering without a entity interacting with it, or even better, code

8000 end_gateway blocks https://gyazo.com/6441f70e0ac66cb7bf2bfc76a0f668fa
after further thought, it may be due to the texture animation rendering process. but i don't have such spike in lag with other animated blocks (sealantuen, prismarine, field of fire) might it just be the block itself? (i don't think it was meant to be used in bulk anyway) apologies for the confusion on my part.
related: beams render for any type of entity intersecting with them: (ie: dropped items) looks cool though. /https://gyazo.com/c8e83dadf3734d05b99e5726a72db1c4

Then it's most likely because it's a tile entity
The "any entity" issue is intended

ooooohh.. i was unaware it was a tile entity. i thought it was a full block with a texture pattern on the sides. makes much more sense now. thanks.
--issue resolved to my satisfaction-- 🙂
PS. the fact that it is rendered as an tile entity should probably be added to the wiki
Thank you for your patience and knowledge 🙂

Reminder: the wiki is not an official source

In servers, when your setting blocks to end gateways/portals at a certain scale, w/ the setblock command or MCedit/WorldEdit, There is a Mass reduction of FPS (like 0.2) and there is a 6 sec delay after you press esc for the pause menu to show up.
Please make a way to remove end portals/gateways in creative on a large scale.
The beam when standing in it is intended, it shows whenever a entity collides with it
Is it still an issue when you keep that in mind?