Index: uspace/app/terminal/terminal.c
===================================================================
--- uspace/app/terminal/terminal.c	(revision 2ab8ab3c0a1e9771074c6e9d07ec1bf5e87ddafc)
+++ uspace/app/terminal/terminal.c	(revision 68a552f0cc0e1665ed70383cada86c9355991a73)
@@ -37,4 +37,5 @@
 #include <adt/list.h>
 #include <adt/prodcons.h>
+#include <as.h>
 #include <errno.h>
 #include <fbfont/font-8x16.h>
@@ -49,4 +50,5 @@
 #include <task.h>
 #include <stdarg.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <str.h>
@@ -86,4 +88,8 @@
 static void term_set_cursor_visibility(con_srv_t *, bool);
 static errno_t term_get_event(con_srv_t *, cons_event_t *);
+static errno_t term_map(con_srv_t *, sysarg_t, sysarg_t, charfield_t **);
+static void term_unmap(con_srv_t *);
+static void term_buf_update(con_srv_t *, sysarg_t, sysarg_t, sysarg_t,
+    sysarg_t);
 
 static con_ops_t con_ops = {
@@ -102,5 +108,8 @@
 	.set_rgb_color = term_set_rgb_color,
 	.set_cursor_visibility = term_set_cursor_visibility,
-	.get_event = term_get_event
+	.get_event = term_get_event,
+	.map = term_map,
+	.unmap = term_unmap,
+	.update = term_buf_update
 };
 
@@ -344,5 +353,5 @@
 				charfield_t *back_field =
 				    chargrid_charfield_at(term->backbuf, x, y);
-				bool update = false;
+				bool cupdate = false;
 
 				if ((front_field->flags & CHAR_FLAG_DIRTY) ==
@@ -350,5 +359,5 @@
 					if (front_field->ch != back_field->ch) {
 						back_field->ch = front_field->ch;
-						update = true;
+						cupdate = true;
 					}
 
@@ -356,5 +365,5 @@
 					    back_field->attrs)) {
 						back_field->attrs = front_field->attrs;
-						update = true;
+						cupdate = true;
 					}
 
@@ -362,5 +371,5 @@
 				}
 
-				if (update) {
+				if (cupdate) {
 					term_update_char(term, &pixelmap, sx, sy, x, y);
 					update = true;
@@ -645,4 +654,119 @@
 }
 
+/** Create shared buffer for efficient rendering.
+ *
+ * @param srv Console server
+ * @param cols Number of columns in buffer
+ * @param rows Number of rows in buffer
+ * @param rbuf Place to store pointer to new sharable buffer
+ *
+ * @return EOK on sucess or an error code
+ */
+static errno_t term_map(con_srv_t *srv, sysarg_t cols, sysarg_t rows,
+    charfield_t **rbuf)
+{
+	terminal_t *term = srv_to_terminal(srv);
+	void *buf;
+
+	fibril_mutex_lock(&term->mtx);
+
+	if (term->ubuf != NULL) {
+		fibril_mutex_unlock(&term->mtx);
+		return EBUSY;
+	}
+
+	buf = as_area_create(AS_AREA_ANY, cols * rows * sizeof(charfield_t),
+	    AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE, AS_AREA_UNPAGED);
+	if (buf == AS_MAP_FAILED) {
+		fibril_mutex_unlock(&term->mtx);
+		return ENOMEM;
+	}
+
+	term->ucols = cols;
+	term->urows = rows;
+	term->ubuf = buf;
+	fibril_mutex_unlock(&term->mtx);
+
+	*rbuf = buf;
+	return EOK;
+}
+
+/** Delete shared buffer.
+ *
+ * @param srv Console server
+ */
+static void term_unmap(con_srv_t *srv)
+{
+	terminal_t *term = srv_to_terminal(srv);
+	void *buf;
+
+	fibril_mutex_lock(&term->mtx);
+
+	buf = term->ubuf;
+	term->ubuf = NULL;
+
+	if (buf != NULL)
+		as_area_destroy(buf);
+
+	fibril_mutex_unlock(&term->mtx);
+}
+
+/** Update area of terminal from shared buffer.
+ *
+ * @param srv Console server
+ * @param c0 Column coordinate of top-left corner (inclusive)
+ * @param r0 Row coordinate of top-left corner (inclusive)
+ * @param c1 Column coordinate of bottom-right corner (exclusive)
+ * @param r1 Row coordinate of bottom-right corner (exclusive)
+ */
+static void term_buf_update(con_srv_t *srv, sysarg_t c0, sysarg_t r0,
+    sysarg_t c1, sysarg_t r1)
+{
+	terminal_t *term = srv_to_terminal(srv);
+	charfield_t *ch;
+	sysarg_t col, row;
+
+	fibril_mutex_lock(&term->mtx);
+
+	if (term->ubuf == NULL) {
+		fibril_mutex_unlock(&term->mtx);
+		return;
+	}
+
+	/* Make sure we have meaningful coordinates, within bounds */
+
+	if (c1 > term->ucols)
+		c1 = term->ucols;
+	if (c1 > term->cols)
+		c1 = term->cols;
+	if (c0 >= c1) {
+		fibril_mutex_unlock(&term->mtx);
+		return;
+	}
+	if (r1 > term->urows)
+		r1 = term->urows;
+	if (r1 > term->rows)
+		r1 = term->rows;
+	if (r0 >= r1) {
+		fibril_mutex_unlock(&term->mtx);
+		return;
+	}
+
+	/* Update front buffer from user buffer */
+
+	for (row = r0; row < r1; row++) {
+		for (col = c0; col < c1; col++) {
+			ch = chargrid_charfield_at(term->frontbuf, col, row);
+			*ch = term->ubuf[row * term->ucols + col];
+		}
+	}
+
+	fibril_mutex_unlock(&term->mtx);
+
+	/* Update terminal */
+	term_update(term);
+	gfx_update(term->gc);
+}
+
 static void deinit_terminal(terminal_t *term)
 {
Index: uspace/app/terminal/terminal.h
===================================================================
--- uspace/app/terminal/terminal.h	(revision 2ab8ab3c0a1e9771074c6e9d07ec1bf5e87ddafc)
+++ uspace/app/terminal/terminal.h	(revision 68a552f0cc0e1665ed70383cada86c9355991a73)
@@ -1,4 +1,4 @@
 /*
- * Copyright (c) 2019 Jiri Svoboda
+ * Copyright (c) 2021 Jiri Svoboda
  * Copyright (c) 2012 Petr Koupy
  * All rights reserved.
@@ -85,4 +85,8 @@
 	sysarg_t top_row;
 
+	sysarg_t ucols;
+	sysarg_t urows;
+	charfield_t *ubuf;
+
 	service_id_t dsid;
 	con_srvs_t srvs;