diff --git a/CHANGES b/CHANGES
index a794b70a72..0c165cc4c4 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,19 @@
 
+3.2.0-dev.44 | 2020-02-14 16:16:54 -0700
+
+  * RE: make the RE_Matcher destructor non-virtual (Max Kellermann)
+
+  * analyzer/protocol/smtp: remove unnecessary nullptr check (Max Kellermann)
+
+  * analyzer/Manager: remove unnecessary clear() calls from destructor (Max Kellermann)
+
+  * analyzer/protocol/http: remove unnecessary empty destructor (Max Kellermann)
+
+  * iosource/pcap/Source: remove unused fields `last_hdr`, `last_data` (Max Kellermann)
+
+  * iosource/Manager: eliminate two std::string copies (Max Kellermann)
+
+
 3.2.0-dev.37 | 2020-02-14 11:09:50 -0800
 
   * Fix various format specifiers (Jon Siwek, Corelight)
diff --git a/VERSION b/VERSION
index d6c32b13ce..8c68c96215 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.2.0-dev.37
+3.2.0-dev.44
diff --git a/src/RE.h b/src/RE.h
index f1a2317659..7ff6df112c 100644
--- a/src/RE.h
+++ b/src/RE.h
@@ -174,12 +174,12 @@ protected:
 	int current_pos;
 };
 
-class RE_Matcher {
+class RE_Matcher final {
 public:
 	RE_Matcher();
 	explicit RE_Matcher(const char* pat);
 	RE_Matcher(const char* exact_pat, const char* anywhere_pat);
-	virtual ~RE_Matcher();
+	~RE_Matcher();
 
 	void AddPat(const char* pat);
 
diff --git a/src/analyzer/Manager.cc b/src/analyzer/Manager.cc
index 189a365263..0bcf690a74 100644
--- a/src/analyzer/Manager.cc
+++ b/src/analyzer/Manager.cc
@@ -70,9 +70,6 @@ Manager::~Manager()
 	for ( analyzer_map_by_port::const_iterator i = analyzers_by_port_udp.begin(); i != analyzers_by_port_udp.end(); i++ )
 		delete i->second;
 
-	analyzers_by_port_udp.clear();
-	analyzers_by_port_tcp.clear();
-
 	// Clean up expected-connection table.
 	while ( conns_by_timeout.size() )
 		{
diff --git a/src/analyzer/protocol/http/HTTP.cc b/src/analyzer/protocol/http/HTTP.cc
index 83349d100a..56359a177e 100644
--- a/src/analyzer/protocol/http/HTTP.cc
+++ b/src/analyzer/protocol/http/HTTP.cc
@@ -176,7 +176,6 @@ void HTTP_Entity::Deliver(int len, const char* data, int trailing_CRLF)
 class HTTP_Entity::UncompressedOutput : public analyzer::OutputHandler {
 public:
 	UncompressedOutput(HTTP_Entity* e)	{ entity = e; }
-	virtual	~UncompressedOutput() { }
 	virtual void DeliverStream(int len, const u_char* data, bool orig)
 		{
 		entity->DeliverBodyClear(len, (char*) data, false);
diff --git a/src/analyzer/protocol/smtp/SMTP.cc b/src/analyzer/protocol/smtp/SMTP.cc
index bdc6503ba1..2cd8148357 100644
--- a/src/analyzer/protocol/smtp/SMTP.cc
+++ b/src/analyzer/protocol/smtp/SMTP.cc
@@ -180,8 +180,7 @@ void SMTP_Analyzer::ProcessLine(int length, const char* line, bool orig)
 			{
 			// Don't know whether it is a command line or
 			// a data line.
-			if ( line_after_gap )
-				delete line_after_gap;
+			delete line_after_gap;
 
 			line_after_gap =
 				new BroString((const u_char *) line, length, 1);
diff --git a/src/iosource/Manager.cc b/src/iosource/Manager.cc
index 96fcaee522..6bfa1ad420 100644
--- a/src/iosource/Manager.cc
+++ b/src/iosource/Manager.cc
@@ -325,8 +325,8 @@ static std::pair<std::string, std::string> split_prefix(std::string path)
 PktSrc* Manager::OpenPktSrc(const std::string& path, bool is_live)
 	{
 	std::pair<std::string, std::string> t = split_prefix(path);
-	std::string prefix = t.first;
-	std::string npath = t.second;
+	const auto& prefix = t.first;
+	const auto& npath = t.second;
 
 	// Find the component providing packet sources of the requested prefix.
 
diff --git a/src/iosource/pcap/Source.cc b/src/iosource/pcap/Source.cc
index 52d87bd3b8..fc9d5618c5 100644
--- a/src/iosource/pcap/Source.cc
+++ b/src/iosource/pcap/Source.cc
@@ -27,8 +27,6 @@ PcapSource::PcapSource(const std::string& path, bool is_live)
 	props.is_live = is_live;
 	pd = nullptr;
 	memset(&current_hdr, 0, sizeof(current_hdr));
-	memset(&last_hdr, 0, sizeof(last_hdr));
-	last_data = nullptr;
 	}
 
 void PcapSource::Open()
@@ -46,7 +44,6 @@ void PcapSource::Close()
 
 	pcap_close(pd);
 	pd = nullptr;
-	last_data = nullptr;
 
 	Closed();
 
@@ -213,7 +210,6 @@ bool PcapSource::ExtractNextPacket(Packet* pkt)
 		return false;
 		}
 
-	last_data = data;
 	pkt->Init(props.link_type, &current_hdr.ts, current_hdr.caplen, current_hdr.len, data);
 
 	if ( current_hdr.len == 0 || current_hdr.caplen == 0 )
@@ -222,8 +218,6 @@ bool PcapSource::ExtractNextPacket(Packet* pkt)
 		return false;
 		}
 
-	last_hdr = current_hdr;
-	last_data = data;
 	++stats.received;
 	stats.bytes_received += current_hdr.len;
 
diff --git a/src/iosource/pcap/Source.h b/src/iosource/pcap/Source.h
index fd2fa0ec53..f32071cb99 100644
--- a/src/iosource/pcap/Source.h
+++ b/src/iosource/pcap/Source.h
@@ -41,8 +41,6 @@ private:
 	pcap_t *pd;
 
 	struct pcap_pkthdr current_hdr;
-	struct pcap_pkthdr last_hdr;
-	const u_char* last_data;
 };
 
 }