diff --git a/html_orig/lang/en.php b/html_orig/lang/en.php
index 0da3aeb..bd0d117 100644
--- a/html_orig/lang/en.php
+++ b/html_orig/lang/en.php
@@ -42,8 +42,9 @@ return [
 	'term.buttons' => 'Button labels',
 	'term.theme' => 'Color scheme',
 	'term.parser_tout_ms' => 'Parser timeout',
-	'term.display_tout_ms' => 'Redraw timeout',
-	'term.fn_alt_mode' => 'Xterm Fn keys',
+	'term.display_tout_ms' => 'Redraw delay',
+	'term.display_cooldown_ms' => 'Redraw cooldown',
+	'term.fn_alt_mode' => 'SS3 Fn keys',
 
 	// terminal color labels
 	'color.0' => 'Black',
diff --git a/html_orig/pages/cfg_term.php b/html_orig/pages/cfg_term.php
index 34a7632..68cf2e7 100644
--- a/html_orig/pages/cfg_term.php
+++ b/html_orig/pages/cfg_term.php
@@ -116,6 +116,12 @@
 		<span class="mq-no-phone">&nbsp;ms</span>
 	</div>
 
+	<div class="Row">
+		<label for="display_cooldown_ms"><?= tr('term.display_cooldown_ms') ?><span class="mq-phone">&nbsp;(ms)</span></label>
+		<input type="number" step=1 min=0 name="display_cooldown_ms" id="display_cooldown_ms" value="%display_cooldown_ms%" required>
+		<span class="mq-no-phone">&nbsp;ms</span>
+	</div>
+
 	<div class="Row checkbox" >
 		<label><?= tr('term.fn_alt_mode') ?></label><!--
 		--><span class="box" tabindex=0 role=checkbox></span>
diff --git a/libesphttpd b/libesphttpd
index 3237c6f..566e95a 160000
--- a/libesphttpd
+++ b/libesphttpd
@@ -1 +1 @@
-Subproject commit 3237c6f8fb9fd91b22980116b89768e1ca21cf66
+Subproject commit 566e95af0c892576825903303ca7c65710cbbb5e
diff --git a/user/cgi_sockets.c b/user/cgi_sockets.c
index a50e68f..eaee457 100644
--- a/user/cgi_sockets.c
+++ b/user/cgi_sockets.c
@@ -11,25 +11,36 @@
 static char sock_buff[SOCK_BUF_LEN];
 
 volatile bool notify_available = true;
+volatile bool notify_cooldown = false;
 
-static ETSTimer notifyTim;
-static ETSTimer notifyTim2;
+static ETSTimer notifyContentTim;
+static ETSTimer notifyLabelsTim;
+static ETSTimer notifyCooldownTim;
 
 // we're trying to do a kind of mutex here, without the actual primitives
 // this might glitch, very rarely.
 // it's recommended to put some delay between setting labels and updating the screen.
 
+/**
+ * Cooldown delay is over
+ * @param arg
+ */
+static void ICACHE_FLASH_ATTR
+notifyCooldownTimCb(void *arg)
+{
+	notify_cooldown = false;
+}
+
 static void ICACHE_FLASH_ATTR
-notifyTimCb(void *arg) {
+notifyContentTimCb(void *arg)
+{
 	void *data = NULL;
 	int max_bl, total_bl;
 	cgiWebsockMeasureBacklog(URL_WS_UPDATE, &max_bl, &total_bl);
 
-	if (!notify_available || (max_bl > 2048)) { // do not send if we have anything significant backlogged
+	if (!notify_available || notify_cooldown || (max_bl > 2048)) { // do not send if we have anything significant backlogged
 		// postpone a little
-		os_timer_disarm(&notifyTim);
-		os_timer_setfn(&notifyTim, notifyTimCb, NULL);
-		os_timer_arm(&notifyTim, 5, 0);
+		TIMER_START(&notifyContentTim, notifyContentTimCb, 5, 0);
 		return;
 	}
 	notify_available = false;
@@ -46,17 +57,18 @@ notifyTimCb(void *arg) {
 	// cleanup
 	screenSerializeToBuffer(NULL, SOCK_BUF_LEN, &data);
 
+	notify_cooldown = true;
 	notify_available = true;
+
+	TIMER_START(&notifyCooldownTim, notifyCooldownTimCb, termconf->display_cooldown_ms, 0);
 }
 
 static void ICACHE_FLASH_ATTR
 notifyLabelsTimCb(void *arg)
 {
-	if (!notify_available) {
+	if (!notify_available || notify_cooldown) {
 		// postpone a little
-		os_timer_disarm(&notifyTim2);
-		os_timer_setfn(&notifyTim2, notifyLabelsTimCb, NULL);
-		os_timer_arm(&notifyTim2, 1, 0);
+		TIMER_START(&notifyLabelsTim, notifyLabelsTimCb, 1, 0);
 		return;
 	}
 	notify_available = false;
@@ -64,7 +76,10 @@ notifyLabelsTimCb(void *arg)
 	screenSerializeLabelsToBuffer(sock_buff, SOCK_BUF_LEN);
 	cgiWebsockBroadcast(URL_WS_UPDATE, sock_buff, (int) strlen(sock_buff), 0);
 
+	notify_cooldown = true;
 	notify_available = true;
+
+	TIMER_START(&notifyCooldownTim, notifyCooldownTimCb, termconf->display_cooldown_ms, 0);
 }
 
 /** Beep */
@@ -87,17 +102,15 @@ void ICACHE_FLASH_ATTR screen_notifyChange(ScreenNotifyChangeTopic topic)
 	// PRs are welcome for a nicer update "queue" solution
 	if (termconf->display_tout_ms == 0) termconf->display_tout_ms = SCR_DEF_DISPLAY_TOUT_MS;
 
+	// NOTE: the timers are restarted if already running
+
 	if (topic == CHANGE_LABELS) {
 		// separate timer from content change timer, to avoid losing that update
-		os_timer_disarm(&notifyTim2);
-		os_timer_setfn(&notifyTim2, notifyLabelsTimCb, NULL);
-		os_timer_arm(&notifyTim2, termconf->display_tout_ms, 0);
+		TIMER_START(&notifyLabelsTim, notifyLabelsTimCb, termconf->display_tout_ms, 0);
 	}
 	else if (topic == CHANGE_CONTENT) {
 		// throttle delay
-		os_timer_disarm(&notifyTim);
-		os_timer_setfn(&notifyTim, notifyTimCb, NULL);
-		os_timer_arm(&notifyTim, termconf->display_tout_ms, 0);
+		TIMER_START(&notifyContentTim, notifyContentTimCb, termconf->display_tout_ms, 0);
 	}
 }
 
diff --git a/user/cgi_term_cfg.c b/user/cgi_term_cfg.c
index 4ddb3c0..4ed4112 100644
--- a/user/cgi_term_cfg.c
+++ b/user/cgi_term_cfg.c
@@ -87,7 +87,7 @@ cgiTermCfgSetParams(HttpdConnData *connData)
 		if (n >= 0) {
 			termconf->parser_tout_ms = n;
 		} else {
-			warn("Bad timeout %s", buff);
+			warn("Bad parser timeout %s", buff);
 			redir_url += sprintf(redir_url, "parser_tout_ms,");
 		}
 	}
@@ -95,14 +95,25 @@ cgiTermCfgSetParams(HttpdConnData *connData)
 	if (GET_ARG("display_tout_ms")) {
 		dbg("Display update idle timeout: %s ms", buff);
 		n = atoi(buff);
-		if (n >= 0) {
+		if (n > 0) {
 			termconf->display_tout_ms = n;
 		} else {
-			warn("Bad timeout %s", buff);
+			warn("Bad update timeout %s", buff);
 			redir_url += sprintf(redir_url, "display_tout_ms,");
 		}
 	}
 
+	if (GET_ARG("display_cooldown_ms")) {
+		dbg("Display update cooldown: %s ms", buff);
+		n = atoi(buff);
+		if (n > 0) {
+			termconf->display_cooldown_ms = n;
+		} else {
+			warn("Bad cooldown %s", buff);
+			redir_url += sprintf(redir_url, "display_cooldown_ms,");
+		}
+	}
+
 	if (GET_ARG("fn_alt_mode")) {
 		dbg("FN alt mode: %s", buff);
 		n = atoi(buff);
@@ -195,6 +206,9 @@ tplTermCfg(HttpdConnData *connData, char *token, void **arg)
 	else if (streq(token, "display_tout_ms")) {
 		sprintf(buff, "%d", termconf->display_tout_ms);
 	}
+	else if (streq(token, "display_cooldown_ms")) {
+		sprintf(buff, "%d", termconf->display_cooldown_ms);
+	}
 	else if (streq(token, "fn_alt_mode")) {
 		sprintf(buff, "%d", (int)termconf->fn_alt_mode);
 	}
diff --git a/user/screen.c b/user/screen.c
index 070d223..ce69653 100644
--- a/user/screen.c
+++ b/user/screen.c
@@ -137,17 +137,40 @@ void terminal_apply_settings(void)
 /** this is used when changing terminal settings that do not affect the screen size */
 void terminal_apply_settings_noclear(void)
 {
-	if (termconf->display_tout_ms == 0) termconf->display_tout_ms = SCR_DEF_DISPLAY_TOUT_MS;
+	bool changed = false;
+
+	// Migrate to v1
+	if (termconf->config_version < 1) {
+		dbg("termconf: Updating to version 1");
+		termconf->display_cooldown_ms = SCR_DEF_DISPLAY_COOLDOWN_MS;
+		changed = 1;
+	}
+
+	termconf->config_version = TERMCONF_VERSION;
+
+	// Validation...
+	if (termconf->display_tout_ms == 0) {
+		termconf->display_tout_ms = SCR_DEF_DISPLAY_TOUT_MS;
+		changed = 1;
+	}
+	if (termconf->display_cooldown_ms == 0) {
+		termconf->display_cooldown_ms = SCR_DEF_DISPLAY_COOLDOWN_MS;
+		changed = 1;
+	}
 
 	memcpy(&termconf_scratch, termconf, sizeof(TerminalConfigBundle));
 	if (W*H > MAX_SCREEN_SIZE) {
 		error("BAD SCREEN SIZE: %d rows x %d cols", H, W);
 		error("reverting terminal settings to default");
 		terminal_restore_defaults();
-		persist_store();
+		changed = true;
 		memcpy(&termconf_scratch, termconf, sizeof(TerminalConfigBundle));
 		screen_init();
 	}
+
+	if (changed) {
+		persist_store();
+	}
 }
 //endregion
 
diff --git a/user/screen.h b/user/screen.h
index b918e24..f98bc41 100644
--- a/user/screen.h
+++ b/user/screen.h
@@ -41,7 +41,8 @@
 #define TERM_BTN_LEN 10
 #define TERM_TITLE_LEN 64
 
-#define SCR_DEF_DISPLAY_TOUT_MS 20
+#define SCR_DEF_DISPLAY_TOUT_MS 10
+#define SCR_DEF_DISPLAY_COOLDOWN_MS 30
 #define SCR_DEF_PARSER_TOUT_MS 10
 #define SCR_DEF_FN_ALT_MODE false
 #define SCR_DEF_WIDTH 26
@@ -49,7 +50,9 @@
 #define SCR_DEF_TITLE "ESPTerm"
 
 /** Maximum screen size (determines size of the static data array) */
-#define MAX_SCREEN_SIZE (80*25)
+#define MAX_SCREEN_SIZE (80*26)
+
+#define TERMCONF_VERSION 1
 
 // --- Persistent Settings ---
 
@@ -64,6 +67,8 @@ typedef struct {
 	u32 parser_tout_ms;
 	u32 display_tout_ms;
 	bool fn_alt_mode; // xterm compatibility mode (alternate codes for some FN keys)
+	u8 config_version;
+	u32 display_cooldown_ms;
 } TerminalConfigBundle;
 
 // Live config
diff --git a/user/syscfg.c b/user/syscfg.c
index d45406f..df27de7 100644
--- a/user/syscfg.c
+++ b/user/syscfg.c
@@ -12,6 +12,8 @@ SystemConfigBundle * const sysconf = &persist.current.sysconf;
 void ICACHE_FLASH_ATTR
 sysconf_apply_settings(void)
 {
+	// !!! Update to current version !!!
+
 	serialInit();
 }
 
diff --git a/user/syscfg.h b/user/syscfg.h
index 6b9f607..92997c9 100644
--- a/user/syscfg.h
+++ b/user/syscfg.h
@@ -10,11 +10,13 @@
 // Size designed for the wifi config structure
 // Must be constant to avoid corrupting user config after upgrade
 #define SYSCONF_SIZE 200
+#define SYSCONF_VERSION 0
 
 typedef struct {
 	u32 uart_baudrate;
 	u8 uart_parity;
 	u8 uart_stopbits;
+	u8 config_version;
 } SystemConfigBundle;
 
 extern SystemConfigBundle * const sysconf;
diff --git a/user/wifimgr.c b/user/wifimgr.c
index 058c45e..942f5f4 100644
--- a/user/wifimgr.c
+++ b/user/wifimgr.c
@@ -156,6 +156,8 @@ wifimgr_apply_settings(void)
 {
 	info("[WiFi] Initializing...");
 
+	// !!! Update to current version !!!
+
 	// Force wifi cycle
 	// Disconnect - may not be needed?
 	WIFI_MODE opmode = wifi_get_opmode();
diff --git a/user/wifimgr.h b/user/wifimgr.h
index 060fb90..5dc9043 100644
--- a/user/wifimgr.h
+++ b/user/wifimgr.h
@@ -17,6 +17,8 @@
 // Must be constant to avoid corrupting user config after upgrade
 #define WIFICONF_SIZE 340
 
+#define WIFICONF_VERSION 0
+
 /**
  * A structure holding all configured WiFi parameters
  * and the active state.
@@ -42,6 +44,7 @@ typedef struct {
 	u8 sta_password[PASSWORD_LEN];
 	bool sta_dhcp_enable;
 	struct ip_info sta_addr;
+	u8 config_version;
 } WiFiConfigBundle;
 
 typedef struct  {