diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c03c570b..3ebabf25 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -212,7 +212,7 @@ jobs:
     - name: Restore cargo caches
       uses: Swatinem/rust-cache@v2
     - name: Run benchmark
-      run: cargo +nightly bench --features "multi-thread,runtime-pattern" --bench spdlog_rs --bench spdlog_rs_pattern | tee bench-results.txt
+      run: cargo +nightly bench --features "multi-thread,runtime-pattern,serde_json" --bench spdlog_rs --bench spdlog_rs_pattern | tee bench-results.txt
     - name: Discard irrelevant changes
       run: git checkout -- spdlog/Cargo.toml
     - name: Process results
diff --git a/spdlog/Cargo.toml b/spdlog/Cargo.toml
index 9aaffaf0..59012203 100644
--- a/spdlog/Cargo.toml
+++ b/spdlog/Cargo.toml
@@ -109,6 +109,7 @@ harness = false
 [[bench]]
 name = "spdlog_rs_pattern"
 path = "benches/spdlog-rs/pattern.rs"
+required-features = ["runtime-pattern", "serde_json"]
 [[bench]]
 name = "fast_log"
 path = "benches/fast_log/main.rs"
diff --git a/spdlog/benches/spdlog-rs/pattern.rs b/spdlog/benches/spdlog-rs/pattern.rs
index ea251e15..111dc4f9 100644
--- a/spdlog/benches/spdlog-rs/pattern.rs
+++ b/spdlog/benches/spdlog-rs/pattern.rs
@@ -5,6 +5,8 @@ extern crate test;
 use std::{cell::RefCell, sync::Arc};
 
 use paste::paste;
+#[cfg(feature = "serde_json")]
+use spdlog::formatter::JsonFormatter;
 use spdlog::{
     formatter::{pattern, Formatter, FullFormatter, Pattern, PatternFormatter},
     prelude::*,
@@ -104,6 +106,12 @@ fn bench_1_full_formatter(bencher: &mut Bencher) {
     bench_formatter(bencher, FullFormatter::new())
 }
 
+#[cfg(feature = "serde_json")]
+#[bench]
+fn bench_1_json_formatter(bencher: &mut Bencher) {
+    bench_formatter(bencher, JsonFormatter::new())
+}
+
 #[bench]
 fn bench_2_full_pattern_ct(bencher: &mut Bencher) {
     bench_full_pattern(
diff --git a/spdlog/src/formatter/json_formatter.rs b/spdlog/src/formatter/json_formatter.rs
index 48156a61..346caed5 100644
--- a/spdlog/src/formatter/json_formatter.rs
+++ b/spdlog/src/formatter/json_formatter.rs
@@ -155,6 +155,10 @@ impl JsonFormatter {
 
         let json_record: JsonRecord = record.into();
 
+        // TODO: https://github.com/serde-rs/json/issues/863
+        //
+        // The performance can be significantly optimized here if the issue can be
+        // solved.
         dest.write_str(&serde_json::to_string(&json_record)?)?;
 
         dest.write_str(__EOL)?;