Performance test Problem

Test1
2 server

Server1
node.mater:true
node.data:false

Server2
node.mater:false
node.data:true

I try to increase shard number to 15 and 20.But The Shards crashed during
benchmark wvery time. Lots of message Lost

So the best result:
Index rate achieve 6k TPS

Test2
After I add a new server3
node.mater:false
node.data:true

Index rate just achieve 4k TPS

Why After I add a new server the Tps became low?

Could u plz help me about this

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