Query is extremely slow

Using loki 2.4.1 - 6 queriers, in distributed architecture.
Very slow performance:

Ingester.TotalReached 		 16
Ingester.TotalChunksMatched 	 0
Ingester.TotalBatches 		 0
Ingester.TotalLinesSent 	 0
Ingester.HeadChunkBytes 	 0 B
Ingester.HeadChunkLines 	 0
Ingester.DecompressedBytes 	 0 B
Ingester.DecompressedLines 	 0
Ingester.CompressedBytes 	 0 B
Ingester.TotalDuplicates 	 0
Store.TotalChunksRef 		 12227
Store.TotalChunksDownloaded 	 50
Store.ChunksDownloadTime 	 2.862452622s
Store.HeadChunkBytes 		 0 B
Store.HeadChunkLines 		 0
Store.DecompressedBytes 	 120 MB
Store.DecompressedLines 	 64611
Store.CompressedBytes 		 21 MB
Store.TotalDuplicates 		 0
Summary.BytesProcessedPerSecond 	 8.8 MB
Summary.LinesProcessedPerSecond 	 4711
Summary.TotalBytesProcessed 		 120 MB
Summary.TotalLinesProcessed 		 64611
Summary.ExecTime 			 13.714739257s
Config:
auth_enabled: false
chunk_store_config:
  max_look_back_period: 0s

server:
  http_listen_port: 3100
  grpc_server_max_recv_msg_size: 64000000

distributor:
  ring:
    kvstore:
      store: memberlist
memberlist:
  join_members:
    - loki-distributed-memberlist

ingester:
  lifecycler:
    ring:
      kvstore:
        store: memberlist
      replication_factor: 1
  chunk_idle_period: 3m
  chunk_block_size: 262144
  chunk_encoding: snappy
  chunk_retain_period: 1m
  max_transfer_retries: 0
  wal:
    dir: /var/loki/wal

schema_config:
  configs:
  - from: 2022-01-05
    store: aws
    object_store: s3
    schema: v11
    index:
      prefix: prefix_index_
      period: 24h

storage_config:
  aws:
    s3: s3://AAA
    dynamodb:
      dynamodb_url: dynamodb://ZZZ

limits_config:
  unordered_writes: true
  ingestion_rate_mb: 2048
  ingestion_burst_size_mb: 4096
  per_stream_rate_limit: 30MB
  per_stream_rate_limit_burst: 150MB
  max_streams_per_user: 0
  max_global_streams_per_user: 0

table_manager:
  retention_deletes_enabled: false
  retention_period: 0s
  index_tables_provisioning:
    provisioned_read_throughput: 10000

query_range:
  align_queries_with_step: true
  max_retries: 5
  split_queries_by_interval: 15m
  cache_results: true
  results_cache:
    cache:
      enable_fifocache: true
      fifocache:
        max_size_items: 1024
        validity: 24h

frontend_worker:
  frontend_address: YYY:9095

frontend:
  log_queries_longer_than: 5s
  compress_responses: true
  tail_proxy_url: http://XXX:3100

Don’t really know where to start investigating and how to understand what the bottleneck is.
Memory & CPU are fine.
I’ve seen other stats from other members go up to 4GB/s so something is definitely wrong here.
Any help is much appreciated.
Thanks.