diff --git a/src/common.cc b/src/common.cc
index bcbaeebe..53a9fe7c 100644
--- a/src/common.cc
+++ b/src/common.cc
@@ -352,7 +352,7 @@ void print_no_update(struct text_object *obj, char *p,
 
 #ifdef BUILD_GUI
 void scan_loadgraph_arg(struct text_object *obj, const char *arg) {
-  scan_graph(obj, arg, 0);
+  scan_graph(obj, arg, 0, FALSE);
 }
 
 double loadgraphval(struct text_object *obj) {
diff --git a/src/core.cc b/src/core.cc
index 0ce2cbdc..d4de97b4 100644
--- a/src/core.cc
+++ b/src/core.cc
@@ -729,7 +729,7 @@ struct text_object *construct_text_object(char *s, const char *arg, long line,
 #ifdef BUILD_GUI
   END OBJ(cpugraph, &update_cpu_usage) get_cpu_count();
   SCAN_CPU(arg, obj->data.i);
-  scan_graph(obj, arg, 1);
+  scan_graph(obj, arg, 1, FALSE);
   DBGP2("Adding $cpugraph for CPU %d", obj->data.i);
   obj->callbacks.graphval = &cpu_barval;
   obj->callbacks.free = &free_cpu;
@@ -1241,9 +1241,9 @@ struct text_object *construct_text_object(char *s, const char *arg, long line,
   END OBJ(memwithbuffersbar, &update_meminfo) scan_bar(obj, arg, 1);
   obj->callbacks.barval = &mem_with_buffers_barval;
 #ifdef BUILD_GUI
-  END OBJ(memgraph, &update_meminfo) scan_graph(obj, arg, 1);
+  END OBJ(memgraph, &update_meminfo) scan_graph(obj, arg, 1, FALSE);
   obj->callbacks.graphval = &mem_barval;
-  END OBJ(memwithbuffersgraph, &update_meminfo) scan_graph(obj, arg, 1);
+  END OBJ(memwithbuffersgraph, &update_meminfo) scan_graph(obj, arg, 1, FALSE);
   obj->callbacks.graphval = &mem_with_buffers_barval;
 #endif /* BUILD_GUI*/
 #ifdef HAVE_SOME_SOUNDCARD_H
@@ -1825,7 +1825,7 @@ struct text_object *construct_text_object(char *s, const char *arg, long line,
       "lua_graph needs arguments: <function name> [height],[width] [gradient "
       "colour 1] [gradient colour 2] [scale] [-t] [-l]") auto [buf, skip] =
       scan_command(arg);
-  scan_graph(obj, arg + skip, 100);
+  scan_graph(obj, arg + skip, 100, FALSE);
   if (buf != nullptr) {
     obj->data.s = buf;
   } else {
@@ -1968,7 +1968,7 @@ struct text_object *construct_text_object(char *s, const char *arg, long line,
   END OBJ(apcupsd_loadbar, &update_apcupsd) scan_bar(obj, arg, 100);
   obj->callbacks.barval = &apcupsd_loadbarval;
 #ifdef BUILD_GUI
-  END OBJ(apcupsd_loadgraph, &update_apcupsd) scan_graph(obj, arg, 100);
+  END OBJ(apcupsd_loadgraph, &update_apcupsd) scan_graph(obj, arg, 100, FALSE);
   obj->callbacks.graphval = &apcupsd_loadbarval;
   END OBJ(apcupsd_loadgauge, &update_apcupsd) scan_gauge(obj, arg, 100);
   obj->callbacks.gaugeval = &apcupsd_loadbarval;
diff --git a/src/diskio.cc b/src/diskio.cc
index 04f26771..130ff45c 100644
--- a/src/diskio.cc
+++ b/src/diskio.cc
@@ -173,7 +173,7 @@ void print_diskio_write(struct text_object *obj, char *p,
 #ifdef BUILD_GUI
 void parse_diskiograph_arg(struct text_object *obj, const char *arg) {
   auto [buf, skip] = scan_command(arg);
-  scan_graph(obj, arg + skip, 0);
+  scan_graph(obj, arg + skip, 0, FALSE);
 
   obj->data.opaque = prepare_diskio_stat(dev_name(buf));
   free_and_zero(buf);
diff --git a/src/exec.cc b/src/exec.cc
index edd60571..81cf486c 100644
--- a/src/exec.cc
+++ b/src/exec.cc
@@ -275,7 +275,7 @@ void scan_exec_arg(struct text_object *obj, const char *arg,
     cmd = scan_gauge(obj, cmd, 100);
   } else if ((execflag & EF_GRAPH) != 0u) {
     auto [buf, skip] = scan_command(cmd);
-    scan_graph(obj, cmd + skip, 100);
+    scan_graph(obj, cmd + skip, 100, FALSE);
     cmd = buf;
     if (cmd == nullptr) {
       NORM_ERR("error parsing arguments to execgraph object");
diff --git a/src/net_stat.cc b/src/net_stat.cc
index b36e1ce4..4cfc55c6 100644
--- a/src/net_stat.cc
+++ b/src/net_stat.cc
@@ -334,7 +334,7 @@ void parse_net_stat_graph_arg(struct text_object *obj, const char *arg,
                               void *free_at_crash) {
   /* scan arguments and get interface name back */
   auto [buf, skip] = scan_command(arg);
-  scan_graph(obj, arg + skip, 0);
+  scan_graph(obj, arg + skip, 0, TRUE);
 
   // default to DEFAULTNETDEV
   if (buf != nullptr) {
diff --git a/src/nvidia.cc b/src/nvidia.cc
index 6f680339..a1f1ea31 100644
--- a/src/nvidia.cc
+++ b/src/nvidia.cc
@@ -458,7 +458,7 @@ int set_nvidia_query(struct text_object *obj, const char *arg,
       break;
     case text_node_t::GRAPH: {
       auto [buf, skip] = scan_command(arg);
-      scan_graph(obj, arg + skip, 100);
+      scan_graph(obj, arg + skip, 100, FALSE);
       arg = buf;
     } break;
     case text_node_t::GAUGE:
diff --git a/src/specials.cc b/src/specials.cc
index 44cecbf3..619faad1 100644
--- a/src/specials.cc
+++ b/src/specials.cc
@@ -50,6 +50,7 @@ struct special_node *specials = nullptr;
 
 int special_count;
 int graph_count = 0;
+double maxspeedval = 1e-47; /* The maximum value among the speed graphs */
 
 std::map<int, double *> graphs;
 
@@ -106,6 +107,7 @@ struct graph {
   Colour first_colour, last_colour;
   double scale;
   char tempgrad;
+  char speedgraph;  /* If the current graph is a speed graph */
 };
 
 struct stippled_hr {
@@ -249,7 +251,7 @@ std::pair<char *, size_t> scan_command(const char *s) {
  * @param[in]  defscale default scale if no scale argument given
  * @return whether parsing was successful
  **/
-bool scan_graph(struct text_object *obj, const char *argstr, double defscale) {
+bool scan_graph(struct text_object *obj, const char *argstr, double defscale, char speedGraph) {
   char first_colour_name[1024] = {'\0'};
   char last_colour_name[1024] = {'\0'};
 
@@ -267,6 +269,10 @@ bool scan_graph(struct text_object *obj, const char *argstr, double defscale) {
   g->scale = defscale;
   g->tempgrad = FALSE;
 
+  if (speedGraph) {
+    g->speedgraph = TRUE;
+  }
+
   if (argstr == nullptr) return false;
 
   /* set tempgrad to true if '-t' specified.
@@ -486,6 +492,10 @@ static void graph_append(struct special_node *graph, double f, char showaslog) {
   if (graph->scaled != 0) {
     graph->scale =
         *std::max_element(graph->graph + 0, graph->graph + graph->graph_width);
+    if (graph->speedgraph) {
+        maxspeedval = graph->scale < maxspeedval ? maxspeedval : graph->scale;
+        graph->scale = maxspeedval;
+    }
     if (graph->scale < 1e-47) {
       /* avoid NaN's when the graph is all-zero (e.g. before the first update)
        * there is nothing magical about 1e-47 here */
@@ -610,6 +620,10 @@ void new_graph(struct text_object *obj, char *buf, int buf_max_size,
   }
 #endif
 
+  if (g->speedgraph) {
+    s->speedgraph = TRUE;
+  }
+
   if (store_graph_data_explicitly.get(*state)) {
     if (s->graph) { s->graph = retrieve_graph(g->id, s->graph_width); }
 
diff --git a/src/specials.h b/src/specials.h
index c2c9114d..2bdc8603 100644
--- a/src/specials.h
+++ b/src/specials.h
@@ -80,6 +80,7 @@ struct special_node {
   Colour last_colour;
   short font_added;
   char tempgrad;
+  char speedgraph;
   struct special_node *next;
 };
 
@@ -97,7 +98,7 @@ const char *scan_gauge(struct text_object *, const char *, double);
 #ifdef BUILD_GUI
 void scan_font(struct text_object *, const char *);
 std::pair<char *, size_t> scan_command(const char *);
-bool scan_graph(struct text_object *, const char *, double);
+bool scan_graph(struct text_object *, const char *, double, char);
 void scan_tab(struct text_object *, const char *);
 void scan_stippled_hr(struct text_object *, const char *);