diff --git a/pkgs/applications/gis/qgis/unwrapped-ltr.nix b/pkgs/applications/gis/qgis/unwrapped-ltr.nix
index a6a9cd67e980..264dce8ac66f 100644
--- a/pkgs/applications/gis/qgis/unwrapped-ltr.nix
+++ b/pkgs/applications/gis/qgis/unwrapped-ltr.nix
@@ -197,6 +197,9 @@ mkDerivation rec {
     done
   '';
 
+  # >9k objects, >3h build time on a normal build slot
+  requiredSystemFeatures = [ "big-parallel" ];
+
   meta = with lib; {
     description = "Free and Open Source Geographic Information System";
     homepage = "https://www.qgis.org";
diff --git a/pkgs/applications/gis/qgis/unwrapped.nix b/pkgs/applications/gis/qgis/unwrapped.nix
index 31c9302518a2..9e3f69a1ec40 100644
--- a/pkgs/applications/gis/qgis/unwrapped.nix
+++ b/pkgs/applications/gis/qgis/unwrapped.nix
@@ -193,6 +193,9 @@ mkDerivation rec {
     done
   '';
 
+  # >9k objects, >3h build time on a normal build slot
+  requiredSystemFeatures = [ "big-parallel" ];
+
   meta = with lib; {
     description = "Free and Open Source Geographic Information System";
     homepage = "https://www.qgis.org";
diff --git a/pkgs/applications/graphics/paraview/default.nix b/pkgs/applications/graphics/paraview/default.nix
index d62b20303b21..6a04470707d6 100644
--- a/pkgs/applications/graphics/paraview/default.nix
+++ b/pkgs/applications/graphics/paraview/default.nix
@@ -123,6 +123,9 @@ stdenv.mkDerivation rec {
     ))
   ];
 
+  # 23k objects, >4h on a normal build slot
+  requiredSystemFeatures = [ "big-parallel" ];
+
   meta = {
     homepage = "https://www.paraview.org";
     description = "3D Data analysis and visualization application";