Why Are Electrs Address Balance Queries Slow (~900ms) on My Dockerized Bitcoin Full Node?

I’m running a Bitcoin Core full node (bitcoind) and using romanz/electrs (via Docker) to provide Electrum server functionality for querying address balances and related wallet info. However, I’m experiencing unexpectedly high latency: querying the balance for a random address consistently takes around 600-900 ms via btc-rpc-explorer RPC interface. For addresses with an enormous number of transactions, the query can take some seconds instead of ms

This is the docker compose yml file:

services:
  bitcoin_service:
    build:
      context: .
      dockerfile: Bitcoin.Dockerfile
      args:
        BITCOIN_VERSION: ${BTC_VERSION}
    image: bitcoin_full_node
    ports:
      - 8333:8333
      - 8332:8332
    volumes:
      - bitcoin_volume:/home/btc-user/.bitcoin
    networks:
      network:
        ipv4_address: 192.168.1.219
    healthcheck:
      test: [
        "CMD",
        "bitcoin-cli",
        "-rpccookiefile=/home/btc-user/.bitcoin/btc.cookie",
        "-rpcport=8332",
        "-rpcconnect=192.168.1.219",
        "getblockchaininfo"
      ]
      interval: 40s
      timeout: 60s
      retries: 45

  electrs:
    image: electrs:latest
    build:
      context: ./electrs/.
    container_name: electrs
    restart: always
    ports:
      - "50001:50001"    # Electrum TCP port exposed on host and container
    environment:
      - ELECTRS_NETWORK=bitcoin
      - ELECTRS_DAEMON_RPC_ADDR=192.168.1.219:8332
      - ELECTRS_DAEMON_P2P_ADDR=192.168.1.219:8333
      - ELECTRS_ELECTRUM_RPC_ADDR=192.168.1.223:50001
      - ELECTRS_LOG_FILTERS=INFO
      - ELECTRS_DB_DIR=/home/electrs/db
      - ELECTRS_VERBOSE_RPC_LOGS=true
      - ELECTRS_IGNORE_MEMPOOL=true
      - ELECTRS_TIMESTAMP_CACHE_CAPACITY=1000000  # Higher cache for faster lookups
      - ELECTRS_INDEX_LOOKUP_LIMIT=10000
      - ELECTRS_COOKIE_FILE=/home/btc-user/.bitcoin/btc.cookie
      - ELECTRS_THREADS=4
      - ELECTRS_DB_CACHE_SIZE=4096
    volumes:
      - electrs_db:/home/electrs/db
      - bitcoin_volume:/home/btc-user/.bitcoin:ro    # Mount same bitcoin data volume (read-only)
    networks:
      network:
        ipv4_address: 192.168.1.223 # new IP in the same subnet
    healthcheck:
      test: ["CMD-SHELL", "timeout 5 bash -c 'echo > /dev/tcp/192.168.1.223/50001'"]
      interval: 40s
      timeout: 60s
      retries: 45
    depends_on:
      bitcoin_service:
        condition: service_healthy

My Setup:

Bitcoin Core runs as a full node with default (non-pruned) settings.
Electrs runs in Docker with the following environment:
ELECTRS_NETWORK=bitcoin
ELECTRS_DAEMON_RPC_ADDR=192.168.1.219:8332
ELECTRS_DAEMON_P2P_ADDR=192.168.1.219:8333
ELECTRS_ELECTRUM_RPC_ADDR=192.168.1.223:50001
ELECTRS_DB_DIR=/home/electrs/db
ELECTRS_TIMESTAMP_CACHE_CAPACITY=1000000
ELECTRS_INDEX_LOOKUP_LIMIT=10000
ELECTRS_THREADS=4
ELECTRS_DB_CACHE_SIZE=4096
Volumes: bitcoin data (read-only) and electrs DB (persistent)
Docker container has 4 threads and 4GB cache configured

Electrs and bitcoind are on the same local network. Problem: Despite this setup, querying a single, random address balance via Electrs takes about 900ms. This seems slow compared to other Electrum servers and my expectations for local, SSD-backed infrastructure.

Hardware Specs:

  • CPU: AMD Ryzen 5 5600 3.5 GHz 6-Core Processor
  • RAM: 16 GB (2 x 8GB) DDR4-3200
  • Storage: Western Digital Blue SN580 2TB NVMe M.2 SSD (PCIe 4.0 x4)
  • Motherboard: Gigabyte A520M K V2 Micro ATX AM4
  • Network: 1GPS Download speed

Questions:

  • Is this latency typical for Electrs on a Dockerized full node?
  • Are there further optimizations I can make in my Docker or Electrs configuration to reduce balance query times?
  • Is there any known bottleneck, either in RocksDB, disk I/O, or Docker networking, that might cause this?
  • What are the typical response times others see for similar setups?

Any insights or tuning suggestions from the community would be greatly appreciated!

Thank you!



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