Particles created by the Ender dragon causes all systems to lag significantly, even on a powerful device. The particle render distance on any setting does not prevent this from happening.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-18171.
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I just tested it on all devices including a gaming computer. Same outcome. Intense lag. Too many particles. At least have the particle render distance work to prevent a threshold of particles from appearing instead of having everything render within a certain radius. 😞