diff --git a/doc/fuzzing.md b/doc/fuzzing.md
--- a/doc/fuzzing.md
+++ b/doc/fuzzing.md
@@ -32,6 +32,13 @@
 objects, and similarly don't want to use non-instrumented cached objects linked
 in.
 
+The fuzzing can be sped up significantly (~200x) by using `afl-clang-fast` and
+`afl-clang-fast++` in place of `afl-gcc` and `afl-g++` when compiling. When
+compiling using `afl-clang-fast`/`afl-clang-fast++` the resulting
+`test_bitcoin_fuzzy` binary will be instrumented in such a way that the AFL
+features "persistent mode" and "deferred forkserver" can be used. See
+https://github.com/mcarpenter/afl/tree/master/llvm_mode for details.
+
 Preparing fuzzing
 ------------------
 
@@ -63,4 +70,3 @@
 
 You may have to change a few kernel parameters to test optimally - `afl-fuzz`
 will print an error and suggestion if so.
-
diff --git a/src/test/test_bitcoin_fuzzy.cpp b/src/test/test_bitcoin_fuzzy.cpp
--- a/src/test/test_bitcoin_fuzzy.cpp
+++ b/src/test/test_bitcoin_fuzzy.cpp
@@ -60,8 +60,7 @@
     return length == 0;
 }
 
-int main(int argc, char **argv) {
-    ECCVerifyHandle globalVerifyHandle;
+int do_fuzz() {
     std::vector<char> buffer;
     if (!read_stdin(buffer)) return 0;
 
@@ -258,3 +257,23 @@
     }
     return 0;
 }
+
+int main(int argc, char **argv) {
+    ECCVerifyHandle globalVerifyHandle;
+#ifdef __AFL_INIT
+    // Enable AFL deferred forkserver mode. Requires compilation using
+    // afl-clang-fast++. See fuzzing.md for details.
+    __AFL_INIT();
+#endif
+
+#ifdef __AFL_LOOP
+    // Enable AFL persistent mode. Requires compilation using afl-clang-fast++.
+    // See fuzzing.md for details.
+    while (__AFL_LOOP(1000)) {
+        do_fuzz();
+    }
+    return 0;
+#else
+    return do_fuzz();
+#endif
+}