diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -28,8 +28,6 @@
   bench/mempool_eviction.cpp \
   bench/base58.cpp \
   bench/lockedpool.cpp \
-  bench/perf.cpp \
-  bench/perf.h \
   bench/prevector.cpp
 
 nodist_bench_bench_bitcoin_SOURCES = $(GENERATED_BENCH_FILES)
diff --git a/src/bench/CMakeLists.txt b/src/bench/CMakeLists.txt
--- a/src/bench/CMakeLists.txt
+++ b/src/bench/CMakeLists.txt
@@ -18,7 +18,6 @@
 	lockedpool.cpp
 	mempool_eviction.cpp
 	merkle_root.cpp
-	perf.cpp
 	prevector.cpp
 	rollingbloom.cpp
 )
diff --git a/src/bench/bench.cpp b/src/bench/bench.cpp
--- a/src/bench/bench.cpp
+++ b/src/bench/bench.cpp
@@ -3,7 +3,6 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <bench/bench.h>
-#include <bench/perf.h>
 
 #include <algorithm>
 #include <cassert>
@@ -96,7 +95,6 @@
 void benchmark::BenchRunner::RunAll(Printer &printer, uint64_t num_evals,
                                     double scaling, const std::string &filter,
                                     bool is_list_only) {
-    perf_init();
     if (!std::ratio_less_equal<benchmark::clock::period, std::micro>::value) {
         std::cerr << "WARNING: Clock precision is worse than microsecond - "
                      "benchmarks may be less accurate!\n";
@@ -125,8 +123,6 @@
     }
 
     printer.footer();
-
-    perf_fini();
 }
 
 bool benchmark::State::UpdateTimer(const benchmark::time_point current_time) {
diff --git a/src/bench/perf.h b/src/bench/perf.h
deleted file mode 100644
--- a/src/bench/perf.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright (c) 2016 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-/** Functions for measurement of CPU cycles */
-#ifndef H_PERF
-#define H_PERF
-
-#include <cstdint>
-
-#if defined(__i386__)
-
-static inline uint64_t perf_cpucycles(void) {
-    uint64_t x;
-    __asm__ volatile(".byte 0x0f, 0x31" : "=A"(x));
-    return x;
-}
-
-#elif defined(__x86_64__)
-
-static inline uint64_t perf_cpucycles(void) {
-    uint32_t hi, lo;
-    __asm__ __volatile__("rdtsc" : "=a"(lo), "=d"(hi));
-    return ((uint64_t)lo) | (((uint64_t)hi) << 32);
-}
-#else
-
-uint64_t perf_cpucycles(void);
-
-#endif
-
-void perf_init(void);
-void perf_fini(void);
-
-#endif // H_PERF
diff --git a/src/bench/perf.cpp b/src/bench/perf.cpp
deleted file mode 100644
--- a/src/bench/perf.cpp
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright (c) 2016 The Bitcoin Core developers
-// Distributed under the MIT software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#include <bench/perf.h>
-
-#if defined(__i386__) || defined(__x86_64__)
-
-/* These architectures support querying the cycle counter
- * from user space, no need for any syscall overhead.
- */
-void perf_init(void) {}
-void perf_fini(void) {}
-
-#elif defined(__linux__)
-
-#include <linux/perf_event.h>
-#include <sys/syscall.h>
-#include <unistd.h>
-
-static int fd = -1;
-static struct perf_event_attr attr;
-
-void perf_init(void) {
-    attr.type = PERF_TYPE_HARDWARE;
-    attr.config = PERF_COUNT_HW_CPU_CYCLES;
-    fd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0);
-}
-
-void perf_fini(void) {
-    if (fd != -1) {
-        close(fd);
-    }
-}
-
-uint64_t perf_cpucycles(void) {
-    uint64_t result = 0;
-    if (fd == -1 ||
-        read(fd, &result, sizeof(result)) < (ssize_t)sizeof(result)) {
-        return 0;
-    }
-    return result;
-}
-
-#else /* Unhandled platform */
-
-void perf_init(void) {}
-void perf_fini(void) {}
-uint64_t perf_cpucycles(void) {
-    return 0;
-}
-
-#endif
diff --git a/src/interfaces/node.h b/src/interfaces/node.h
--- a/src/interfaces/node.h
+++ b/src/interfaces/node.h
@@ -167,15 +167,6 @@
     //! Get dust relay fee.
     virtual CFeeRate getDustRelayFee() = 0;
 
-    //! Get fallback fee.
-    virtual CFeeRate getFallbackFee() = 0;
-
-    //! Get pay tx fee.
-    virtual CFeeRate getPayTxFee() = 0;
-
-    //! Set pay tx fee.
-    virtual void setPayTxFee(CFeeRate rate) = 0;
-
     //! Execute rpc command.
     virtual UniValue executeRpc(Config &config, const std::string &command,
                                 const UniValue &params,
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -217,13 +217,6 @@
         Amount getMaxTxFee() override { return ::maxTxFee; }
         CFeeRate estimateSmartFee() override { return g_mempool.estimateFee(); }
         CFeeRate getDustRelayFee() override { return ::dustRelayFee; }
-        CFeeRate getFallbackFee() override {
-            CHECK_WALLET(return CWallet::fallbackFee);
-        }
-        CFeeRate getPayTxFee() override { CHECK_WALLET(return ::payTxFee); }
-        void setPayTxFee(CFeeRate rate) override {
-            CHECK_WALLET(::payTxFee = rate);
-        }
         UniValue executeRpc(Config &config, const std::string &command,
                             const UniValue &params,
                             const std::string &uri) override {