diff --git a/ci/iterations-localnet.sh b/ci/iterations-localnet.sh
index ec9cb17e9c..6e2e07a336 100755
--- a/ci/iterations-localnet.sh
+++ b/ci/iterations-localnet.sh
@@ -25,8 +25,7 @@ fi
 build() {
   $genPipeline && return
   source ci/rust-version.sh stable
-
-  _ scripts/ulimit-n.sh
+  source scripts/ulimit-n.sh
   _ cargo +$rust_stable build --all
 }
 
diff --git a/multinode-demo/bootstrap-leader.sh b/multinode-demo/bootstrap-leader.sh
index 6957ae007e..070513cd36 100755
--- a/multinode-demo/bootstrap-leader.sh
+++ b/multinode-demo/bootstrap-leader.sh
@@ -31,7 +31,11 @@ else
   program="$solana_fullnode"
 fi
 
-tune_system
+if [[ -z $CI ]]; then # Skip in CI
+  # shellcheck source=scripts/tune-system.sh
+  source "$SOLANA_ROOT"/scripts/tune-system.sh
+fi
+
 
 $solana_ledger_tool --ledger "$SOLANA_CONFIG_DIR"/bootstrap-leader-ledger verify
 
diff --git a/multinode-demo/common.sh b/multinode-demo/common.sh
index c7885285a6..6bd2d05e4e 100644
--- a/multinode-demo/common.sh
+++ b/multinode-demo/common.sh
@@ -67,45 +67,6 @@ export RUST_BACKTRACE=1
 # shellcheck source=scripts/configure-metrics.sh
 source "$SOLANA_ROOT"/scripts/configure-metrics.sh
 
-tune_system() {
-  # Skip in CI
-  [[ -z $CI ]] || return 0
-
-  # shellcheck source=scripts/ulimit-n.sh
-  source "$SOLANA_ROOT"/scripts/ulimit-n.sh
-
-  # Reference: https://medium.com/@CameronSparr/increase-os-udp-buffers-to-improve-performance-51d167bb1360
-  if [[ $(uname) = Linux ]]; then
-    (
-      set -x +e
-      # test the existence of the sysctls before trying to set them
-      # go ahead and return true and don't exit if these calls fail
-      sysctl net.core.rmem_max 2>/dev/null 1>/dev/null &&
-          sudo sysctl -w net.core.rmem_max=161061273 1>/dev/null 2>/dev/null
-
-      sysctl net.core.rmem_default 2>/dev/null 1>/dev/null &&
-          sudo sysctl -w net.core.rmem_default=161061273 1>/dev/null 2>/dev/null
-
-      sysctl net.core.wmem_max 2>/dev/null 1>/dev/null &&
-          sudo sysctl -w net.core.wmem_max=161061273 1>/dev/null 2>/dev/null
-
-      sysctl net.core.wmem_default 2>/dev/null 1>/dev/null &&
-          sudo sysctl -w net.core.wmem_default=161061273 1>/dev/null 2>/dev/null
-    ) || true
-  fi
-
-  if [[ $(uname) = Darwin ]]; then
-    (
-      if [[ $(sysctl net.inet.udp.maxdgram | cut -d\  -f2) != 65535 ]]; then
-        echo "Adjusting maxdgram to allow for large UDP packets, see BLOB_SIZE in src/packet.rs:"
-        set -x
-        sudo sysctl net.inet.udp.maxdgram=65535
-      fi
-    )
-
-  fi
-}
-
 fullnode_usage() {
   if [[ -n $1 ]]; then
     echo "$*"
diff --git a/multinode-demo/fullnode.sh b/multinode-demo/fullnode.sh
index 4ac6f6e0d6..cff28629dc 100755
--- a/multinode-demo/fullnode.sh
+++ b/multinode-demo/fullnode.sh
@@ -62,7 +62,11 @@ accounts: $accounts_config_dir
 ======================================================================
 EOF
 
-tune_system
+if [[ -z $CI ]]; then # Skip in CI
+  # shellcheck source=scripts/tune-system.sh
+  source "$SOLANA_ROOT"/scripts/tune-system.sh
+fi
+
 
 rsync_url() { # adds the 'rsync://` prefix to URLs that need it
   declare url="$1"
diff --git a/scripts/tune-system.sh b/scripts/tune-system.sh
new file mode 100644
index 0000000000..3d58f2a75e
--- /dev/null
+++ b/scripts/tune-system.sh
@@ -0,0 +1,40 @@
+# |source| this file
+#
+# Adjusts system settings for optimal fullnode performance
+#
+
+# shellcheck source=scripts/ulimit-n.sh
+source "$(dirname "${BASH_SOURCE[0]}")"/ulimit-n.sh
+
+# Reference: https://medium.com/@CameronSparr/increase-os-udp-buffers-to-improve-performance-51d167bb1360
+if [[ $(uname) = Linux ]]; then
+  (
+    set -x +e
+    # test the existence of the sysctls before trying to set them
+    # go ahead and return true and don't exit if these calls fail
+    sysctl net.core.rmem_max 2>/dev/null 1>/dev/null &&
+        sudo sysctl -w net.core.rmem_max=161061273 1>/dev/null 2>/dev/null
+
+    sysctl net.core.rmem_default 2>/dev/null 1>/dev/null &&
+        sudo sysctl -w net.core.rmem_default=161061273 1>/dev/null 2>/dev/null
+
+    sysctl net.core.wmem_max 2>/dev/null 1>/dev/null &&
+        sudo sysctl -w net.core.wmem_max=161061273 1>/dev/null 2>/dev/null
+
+    sysctl net.core.wmem_default 2>/dev/null 1>/dev/null &&
+        sudo sysctl -w net.core.wmem_default=161061273 1>/dev/null 2>/dev/null
+  ) || true
+fi
+
+if [[ $(uname) = Darwin ]]; then
+  (
+    if [[ $(sysctl net.inet.udp.maxdgram | cut -d\  -f2) != 65535 ]]; then
+      echo "Adjusting maxdgram to allow for large UDP packets, see BLOB_SIZE in src/packet.rs:"
+      set -x
+      sudo sysctl net.inet.udp.maxdgram=65535
+    fi
+  )
+
+fi
+
+
diff --git a/scripts/ulimit-n.sh b/scripts/ulimit-n.sh
old mode 100755
new mode 100644
index 09b2c14f83..4537d3e850
--- a/scripts/ulimit-n.sh
+++ b/scripts/ulimit-n.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# |source| this file
 #
 # Adjust the maximum number of files that may be opened to as large as possible.
 #