diff --git a/activitystreams.go b/activitystreams.go
index 21652a5..173c6f1 100644
--- a/activitystreams.go
+++ b/activitystreams.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"net/http"
 	"strings"
 	"time"
diff --git a/api.go b/api.go
index aa9af52..e6bdd99 100644
--- a/api.go
+++ b/api.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"io/ioutil"
 	"net/http"
 	"strings"
diff --git a/cache.go b/cache.go
index 38b00b7..c498b03 100644
--- a/cache.go
+++ b/cache.go
@@ -3,7 +3,7 @@ package main
 import (
 	"context"
 	"database/sql"
-	"encoding/json"
+	"log"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -11,11 +11,13 @@ import (
 	"time"
 )
 
+var cacheMutexMapMutex *sync.Mutex
 var cacheMutexes map[string]*sync.Mutex
 var cacheDb *sql.DB
 var cacheDbWriteMutex = &sync.Mutex{}
 
 func initCache() (err error) {
+	cacheMutexMapMutex = &sync.Mutex{}
 	cacheMutexes = map[string]*sync.Mutex{}
 	cacheDb, err = sql.Open("sqlite3", ":memory:")
 	if err != nil {
@@ -52,36 +54,23 @@ func cacheMiddleware(next http.Handler) http.Handler {
 			// check bypass query
 			!(requestURL != nil && requestURL.Query().Get("cache") == "0") {
 			// Check cache mutex
+			cacheMutexMapMutex.Lock()
 			if cacheMutexes[path] == nil {
 				cacheMutexes[path] = &sync.Mutex{}
 			}
-			// Lock mutex - prevents multiple new renderings
-			cacheMutexes[path].Lock()
+			cacheMutexMapMutex.Unlock()
 			// Get cache
+			cm := cacheMutexes[path]
+			cm.Lock()
 			cacheTime, header, body := getCache(r.Context(), path)
+			cm.Unlock()
 			if cacheTime == 0 {
-				// No cache available
-				recorder := httptest.NewRecorder()
-				next.ServeHTTP(recorder, r)
-				// copy values from recorder
-				code := recorder.Code
-				// send response
-				for k, v := range recorder.Header() {
-					w.Header()[k] = v
-				}
-				now := time.Now()
-				setCacheHeaders(w, now.Format(time.RFC1123), time.Unix(now.Unix()+appConfig.Cache.Expiration, 0).Format(time.RFC1123))
-				w.Header().Set("GoBlog-Cache", "MISS")
-				w.WriteHeader(code)
-				_, _ = w.Write(recorder.Body.Bytes())
-				// Save cache
-				if code == http.StatusOK {
-					saveCache(path, now, recorder.Header(), recorder.Body.Bytes())
-				}
-				cacheMutexes[path].Unlock()
+				cm.Lock()
+				// Render cache
+				renderCache(path, next, w, r)
+				cm.Unlock()
 				return
 			}
-			cacheMutexes[path].Unlock()
 			cacheTimeString := time.Unix(cacheTime, 0).Format(time.RFC1123)
 			expiresTimeString := time.Unix(cacheTime+appConfig.Cache.Expiration, 0).Format(time.RFC1123)
 			// check conditional request
@@ -113,6 +102,28 @@ func setCacheHeaders(w http.ResponseWriter, cacheTimeString string, expiresTimeS
 	w.Header().Set("Expires", expiresTimeString)
 }
 
+func renderCache(path string, next http.Handler, w http.ResponseWriter, r *http.Request) {
+	log.Println("Render")
+	// No cache available
+	recorder := httptest.NewRecorder()
+	next.ServeHTTP(recorder, r)
+	// copy values from recorder
+	code := recorder.Code
+	// send response
+	for k, v := range recorder.Header() {
+		w.Header()[k] = v
+	}
+	now := time.Now()
+	setCacheHeaders(w, now.Format(time.RFC1123), time.Unix(now.Unix()+appConfig.Cache.Expiration, 0).Format(time.RFC1123))
+	w.Header().Set("GoBlog-Cache", "MISS")
+	w.WriteHeader(code)
+	_, _ = w.Write(recorder.Body.Bytes())
+	// Save cache
+	if code == http.StatusOK {
+		saveCache(path, now, recorder.Header(), recorder.Body.Bytes())
+	}
+}
+
 func getCache(context context.Context, path string) (creationTime int64, header map[string][]string, body []byte) {
 	var headerBytes []byte
 	allowedTime := time.Now().Unix() - appConfig.Cache.Expiration
diff --git a/go.mod b/go.mod
index c32b498..575db83 100644
--- a/go.mod
+++ b/go.mod
@@ -12,6 +12,7 @@ require (
 	github.com/gorilla/feeds v1.1.1
 	github.com/jeremywohl/flatten v1.0.1
 	github.com/jinzhu/gorm v1.9.16 // indirect
+	github.com/json-iterator/go v1.1.10
 	github.com/klauspost/cpuid v1.3.1 // indirect
 	github.com/kr/pretty v0.2.1 // indirect
 	github.com/kr/text v0.2.0 // indirect
@@ -41,8 +42,8 @@ require (
 	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
 	golang.org/x/net v0.0.0-20201006153459-a7d1128ccaa0 // indirect
 	golang.org/x/sync v0.0.0-20200930132711-30421366ff76 // indirect
-	golang.org/x/sys v0.0.0-20201006155630-ac719f4daadf // indirect
-	golang.org/x/tools v0.0.0-20201005185003-576e169c3de7 // indirect
+	golang.org/x/sys v0.0.0-20201007082116-8445cc04cbdf // indirect
+	golang.org/x/tools v0.0.0-20201007032633-0806396f153e // indirect
 	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
 	gopkg.in/ini.v1 v1.62.0 // indirect
 	gopkg.in/yaml.v2 v2.3.0 // indirect
diff --git a/go.sum b/go.sum
index 874329e..b332704 100644
--- a/go.sum
+++ b/go.sum
@@ -86,6 +86,7 @@ github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Z
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/pprof v0.0.0-20190515194954-54271f7e092f/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
@@ -135,7 +136,10 @@ github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.0.1/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
+github.com/json-iterator/go v1.1.6 h1:MrUvLMLTMxbqFJ9kzlvat/rYZqZnW3u4wkLzWTaFwKs=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
+github.com/json-iterator/go v1.1.10 h1:Kz6Cvnvv2wGdaG/V8yMvfkmNiXq9Ya2KUv4rouJJr68=
+github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
 github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
@@ -198,7 +202,11 @@ github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQz
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/mapstructure v1.3.3 h1:SzB1nHZ2Xi+17FP0zVQBHIZqvwRN9408fJO8h+eeNA8=
 github.com/mitchellh/mapstructure v1.3.3/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
@@ -398,8 +406,8 @@ golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200724161237-0e2f3a69832c h1:UIcGWL6/wpCfyGuJnRFJRurA+yj8RrW7Q6x2YMCXt6c=
 golang.org/x/sys v0.0.0-20200724161237-0e2f3a69832c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201006155630-ac719f4daadf h1:Bg47KQy0JhTHuf4sLiQwTMKwUMfSDwgSGatrxGR7nLM=
-golang.org/x/sys v0.0.0-20201006155630-ac719f4daadf/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201007082116-8445cc04cbdf h1:AvBTl0xbF/KtHyvm61X4gSPF7/dKJ/xQqJwKr1Qu9no=
+golang.org/x/sys v0.0.0-20201007082116-8445cc04cbdf/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
@@ -431,8 +439,8 @@ golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20191130070609-6e064ea0cf2d/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
-golang.org/x/tools v0.0.0-20201005185003-576e169c3de7 h1:YTAUHYgZh/ZOA35/OrjTDmFFKb6ddkBL1Zgtl9r8Di8=
-golang.org/x/tools v0.0.0-20201005185003-576e169c3de7/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
+golang.org/x/tools v0.0.0-20201007032633-0806396f153e h1:FJA2W4BQfMGZ+CD/tiAc39HXecuRsJl3EuczaSUu/Yk=
+golang.org/x/tools v0.0.0-20201007032633-0806396f153e/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
diff --git a/indieauth.go b/indieauth.go
index f855c84..5891df3 100644
--- a/indieauth.go
+++ b/indieauth.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"net/http"
diff --git a/main.go b/main.go
index 7015d3f..72fe4ef 100644
--- a/main.go
+++ b/main.go
@@ -4,8 +4,12 @@ import (
 	"log"
 	"os"
 	"os/signal"
+
+	jsoniter "github.com/json-iterator/go"
 )
 
+var json = jsoniter.ConfigCompatibleWithStandardLibrary
+
 func main() {
 	// Initialize config
 	log.Println("Initialize configuration...")
diff --git a/micropub.go b/micropub.go
index 03d22c1..f85bdd0 100644
--- a/micropub.go
+++ b/micropub.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"errors"
 	"net/http"
 	"strings"
diff --git a/minify.go b/minify.go
index 849cd04..5f46381 100644
--- a/minify.go
+++ b/minify.go
@@ -2,21 +2,21 @@ package main
 
 import (
 	"github.com/tdewolff/minify/v2"
-	"github.com/tdewolff/minify/v2/css"
-	"github.com/tdewolff/minify/v2/html"
-	"github.com/tdewolff/minify/v2/js"
-	"github.com/tdewolff/minify/v2/json"
-	"github.com/tdewolff/minify/v2/xml"
+	mCss "github.com/tdewolff/minify/v2/css"
+	mHtml "github.com/tdewolff/minify/v2/html"
+	mJs "github.com/tdewolff/minify/v2/js"
+	mJson "github.com/tdewolff/minify/v2/json"
+	mXml "github.com/tdewolff/minify/v2/xml"
 )
 
 var minifier *minify.M
 
 func initMinify() {
 	minifier = minify.New()
-	minifier.AddFunc("text/html", html.Minify)
-	minifier.AddFunc("text/css", css.Minify)
-	minifier.AddFunc("application/javascript", js.Minify)
-	minifier.AddFunc("application/rss+xml", xml.Minify)
-	minifier.AddFunc("application/atom+xml", xml.Minify)
-	minifier.AddFunc("application/feed+json", json.Minify)
+	minifier.AddFunc("text/html", mHtml.Minify)
+	minifier.AddFunc("text/css", mCss.Minify)
+	minifier.AddFunc("application/javascript", mJs.Minify)
+	minifier.AddFunc("application/rss+xml", mXml.Minify)
+	minifier.AddFunc("application/atom+xml", mXml.Minify)
+	minifier.AddFunc("application/feed+json", mJson.Minify)
 }