diff -urNp -x '*.orig' irssi-1.2.2.org/src/irc/dcc/dcc-rec.h irssi-1.2.2/src/irc/dcc/dcc-rec.h
--- irssi-1.2.2.org/src/irc/dcc/dcc-rec.h	2019-08-29 15:48:43.000000000 +0200
+++ irssi-1.2.2/src/irc/dcc/dcc-rec.h	2021-05-04 21:22:16.382408355 +0200
@@ -22,6 +22,12 @@ uoff_t transfd; /* bytes transferred */
 
 int pasv_id; /* DCC Id for passive DCCs. <0 means a passive DCC, >=0 means a standard DCC */
 
+int timeout_tag;
+
+unsigned long skip_bytes;
+unsigned long limit_starttime;
+unsigned long max_speed;
+
 unsigned int destroyed:1; /* We're about to destroy this DCC recond */
 
 GHashTable *module_data;
diff -urNp -x '*.orig' irssi-1.2.2.org/src/irc/dcc/dcc-send.c irssi-1.2.2/src/irc/dcc/dcc-send.c
--- irssi-1.2.2.org/src/irc/dcc/dcc-send.c	2019-08-29 15:48:46.000000000 +0200
+++ irssi-1.2.2/src/irc/dcc/dcc-send.c	2021-05-04 21:22:16.382408355 +0200
@@ -250,17 +250,87 @@ static void sig_dcc_destroyed(SEND_DCC_R
 {
 	if (!IS_DCC_SEND(dcc)) return;
 
+	if (dcc->timeout_tag != -1)
+		g_source_remove(dcc->timeout_tag);
+
 	if (dcc->fhandle != -1)
 		close(dcc->fhandle);
 
 	dcc_queue_send_next(dcc->queue);
 }
 
+static int sent_too_much(SEND_DCC_REC *dcc)
+{
+	GTimeVal gtv;
+	gulong timediff, curtime;
+	gulong transfd, speed;
+
+	/* 0 == unlimited speed */
+	if (dcc->max_speed == 0) return 0;
+	
+	/* get time difference in milliseconds */
+	g_get_current_time(&gtv);
+	curtime = (gtv.tv_sec * 1000) + (gtv.tv_usec / 1000);
+
+	transfd = (dcc->transfd - dcc->skip_bytes);
+	timediff = curtime - dcc->limit_starttime + 1;
+	speed = ((transfd * 1000) / timediff);
+
+	/* reset speed counter every 30 seconds */
+	if (timediff >= 30000) {
+		dcc->limit_starttime = curtime;
+		dcc->skip_bytes = dcc->transfd;
+	}
+	
+	return (speed > (dcc->max_speed * 1024));
+}
+
+static void dcc_send_data(SEND_DCC_REC *dcc);
+
+static void reset_dcc_send(SEND_DCC_REC *dcc)
+{
+	if (g_slist_find(dcc_conns, dcc) == NULL) {
+		/* the DCC was closed during the wait */
+		return;
+	}
+
+	if (dcc->timeout_tag != -1)
+		g_source_remove(dcc->timeout_tag);
+	dcc->timeout_tag = -1;
+	
+	dcc->tagwrite = g_input_add(dcc->handle, G_INPUT_WRITE,
+				    (GInputFunction) dcc_send_data, dcc);
+
+	return;
+}
+
 /* input function: DCC SEND - we're ready to send more data */
 static void dcc_send_data(SEND_DCC_REC *dcc)
 {
         char buffer[512];
-	int ret;
+	int ret, max_speed;
+	GTimeVal gtv;
+
+	max_speed = settings_get_int("dcc_send_top_speed");
+	if (max_speed != dcc->max_speed) {
+		/* speed setting has changed, calculate speed from current position 
+		   instead of from the start to eliminate speed boosts/slowdowns */
+
+		dcc->max_speed = max_speed;
+		dcc->skip_bytes = dcc->transfd;
+		
+		g_get_current_time(&gtv);
+		dcc->limit_starttime = (gtv.tv_sec * 1000) + (gtv.tv_usec / 1000);
+	}
+	
+	if (sent_too_much(dcc)) {
+		/* disable calling this function for 1/10th of a second. */
+		g_source_remove(dcc->tagwrite);
+		dcc->tagwrite = -1;
+		dcc->timeout_tag = g_timeout_add(100, (GSourceFunc) 
+			reset_dcc_send, dcc);
+		return;
+	}
 
 	ret = read(dcc->fhandle, buffer, sizeof(buffer));
 	if (ret <= 0) {
@@ -316,6 +386,7 @@ static void dcc_send_connected(SEND_DCC_
         GIOChannel *handle;
 	IPADDR addr;
 	int port;
+	GTimeVal gtv;
 
 	/* accept connection */
 	handle = net_accept(dcc->handle, &addr, &port);
@@ -330,6 +401,13 @@ static void dcc_send_connected(SEND_DCC_
 	g_source_remove(dcc->tagconn);
         dcc->tagconn = -1;
 
+	dcc->skip_bytes = 0;
+	dcc->max_speed = settings_get_int("dcc_send_top_speed");
+
+	/* get starttime in milliseconds */
+	g_get_current_time(&gtv);
+	dcc->limit_starttime = (gtv.tv_sec * 1000) + (gtv.tv_usec / 1000);
+
 	dcc->starttime = time(NULL);
 	dcc->handle = handle;
 	memcpy(&dcc->addr, &addr, sizeof(IPADDR));
@@ -434,6 +512,7 @@ static int dcc_send_one_file(int queue,
 	dcc->size = st.st_size;
 	dcc->fhandle = hfile;
 	dcc->queue = queue;
+	dcc->timeout_tag = -1;
         dcc->file_quoted = strchr(fname, ' ') != NULL;
 	if (!passive) {
 		dcc->tagconn = g_input_add(handle, G_INPUT_READ,
@@ -473,6 +552,7 @@ void dcc_send_init(void)
         dcc_register_type("SEND");
 	settings_add_str("dcc", "dcc_upload_path", "~");
 	settings_add_bool("dcc", "dcc_send_replace_space_with_underscore", FALSE);
+	settings_add_int("dcc", "dcc_send_top_speed", 0);
 	signal_add("dcc destroyed", (SIGNAL_FUNC) sig_dcc_destroyed);
 	signal_add("dcc reply send pasv", (SIGNAL_FUNC) dcc_send_connect);
 	command_bind("dcc send", NULL, (SIGNAL_FUNC) cmd_dcc_send);