diff --git a/flow/scripts/open.tcl b/flow/scripts/open.tcl
index 64b7617da4..bcd8127250 100644
--- a/flow/scripts/open.tcl
+++ b/flow/scripts/open.tcl
@@ -60,6 +60,68 @@ proc read_timing {input_file} {
 if {[env_var_equals GUI_TIMING 1]} {
   puts "GUI_TIMING=1 reading timing, takes a little while for large designs..."
   read_timing $input_file
+
+  gui::save_display_controls
+
+  set height [[[ord::get_db_block] getBBox] getDY]
+  set height [ord::dbu_to_microns $height]
+  set resolution [expr $height / 1000]
+
+  # FIXME reenable when there is a way to disable the rendered clock tree
+  #
+  # foreach clock [get_clocks *] {
+  #   if { [llength [get_property $clock sources]] > 0 } {
+  #     set clock_name [get_name $clock]
+  #     save_clocktree_image -clock $clock_name \
+  #         -width 100 -height 100 \
+  #         $::env(OBJECTS_DIR)/dummy.png
+  #     break
+  #   }
+  # }
+
+  # FIXME IRDrop heatmap should be added, but it has to be skipped
+  # when there is no IRDrop heatmap to be rendered.
+
+  set block [ord::get_db_block]
+  set insts [$block getInsts]
+  set placed 1
+  foreach inst $insts {
+    set status [$inst getPlacementStatus]
+    # status is not in the list of PLACED, LOCKED
+    if {[lsearch {PLACED LOCKED} $status] == -1} {
+      set placed 0
+      break
+    }
+  }
+
+  set have_routes [expr {$placed && [grt::have_routes]}]
+
+  foreach heatmap {Placement Routing RUDY Power} {
+    if {[string equal $heatmap Routing] && !$have_routes} {
+      # Skipping $heatmap heatmap, no routes available
+      continue
+    }
+    if {[string equal $heatmap IRDrop] &&
+        (![env_var_exists_and_non_empty PWR_NETS_VOLTAGES] ||
+         ![grt::have_routes])} {
+      # Skipping $heatmap heatmap, no PWR_NETS_VOLTAGES available
+      continue
+    }
+    if {[lsearch {RUDY Placement} $heatmap] != -1 && !$placed} {
+      # Skipping $heatmap heatmap, not all instances are placed
+      continue
+    }
+    puts "Prerendering $heatmap heatmap..."
+    gui::set_heatmap $heatmap rebuild 1
+    gui::dump_heatmap $heatmap $::env(REPORTS_DIR)/dummy.png
+  }
+
+  log_cmd gui::select_chart "Endpoint Slack"
+  log_cmd gui::update_timing_report
+
+  gui::clear_highlights -1
+  gui::clear_selections
+  gui::restore_display_controls
 }
 
 fast_route
@@ -67,5 +129,5 @@ fast_route
 if {[env_var_equals GUI_SHOW 1]} {
   # Show the GUI when it is ready; it is unresponsive(with modal requesters
   # saying it is unresponsive) until everything is loaded
-  gui::unminimize
+  log_cmd gui::unminimize
 }