we are seeing similar perf issues with counter writes - to reproduce:

cassandra-stress counter_write n=100000 no-warmup cl=LOCAL_QUORUM -rate 
threads=50 -mode native cql3 user=<user> password=<pw> -name <cluster_name> 

op rate: 39,260 ops (4.1) and 63,689 ops (4.0)
latency 99th percentile: 7.7ms (4.1) and 1.8ms (4.0)
Total GC count: 750 (4.1) and 744 (4.0)
Avg GC time: 106 ms (4.1) and 110.1 ms (4.0)

    On Wednesday, March 27, 2024 at 12:18:50 AM PDT, ranju goel 
<goel.ra...@gmail.com> wrote:  
 Hi All,

Was going through this mail chain 
(https://www.mail-archive.com/user@cassandra.apache.org/msg63564.html) and was 
wondering that if this could cause a performance degradation in 4.1 without 
changing compactionThroughput. 

As seeing performance dip in Read/Write after upgrading from 4.0 to 4.1.


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