diff --git a/lib/turbo_tests/cli.rb b/lib/turbo_tests/cli.rb
index ed80ba7..09a8c23 100644
--- a/lib/turbo_tests/cli.rb
+++ b/lib/turbo_tests/cli.rb
@@ -17,6 +17,7 @@ def run
       verbose = false
       fail_fast = nil
       seed = nil
+      nice = false
 
       OptionParser.new { |opts|
         opts.banner = <<~BANNER
@@ -81,6 +82,10 @@ def run
         opts.on("--seed SEED", "Seed for rspec") do |s|
           seed = s
         end
+
+        opts.on("--nice", "execute test commands with low priority") do
+          nice = true
+        end
       }.parse!(@argv)
 
       requires.each { |f| require(f) }
@@ -106,7 +111,8 @@ def run
         verbose: verbose,
         fail_fast: fail_fast,
         count: count,
-        seed: seed
+        seed: seed,
+        nice: nice
       )
 
       if success
diff --git a/lib/turbo_tests/runner.rb b/lib/turbo_tests/runner.rb
index 1a74b76..e078ade 100644
--- a/lib/turbo_tests/runner.rb
+++ b/lib/turbo_tests/runner.rb
@@ -22,6 +22,7 @@ def self.run(opts = {})
       count = opts.fetch(:count, nil)
       seed = opts.fetch(:seed) || rand(0xFFFF).to_s
       seed_used = !opts[:seed].nil?
+      nice = opts.fetch(:nice, false)
 
       if verbose
         STDERR.puts "VERBOSE"
@@ -38,7 +39,8 @@ def self.run(opts = {})
         fail_fast: fail_fast,
         count: count,
         seed: seed,
-        seed_used: seed_used
+        seed_used: seed_used,
+        nice: nice
       ).run
     end
 
@@ -55,6 +57,7 @@ def initialize(opts)
       @failure_count = 0
       @seed = opts[:seed]
       @seed_used = opts[:seed_used]
+      @nice = opts[:nice]
 
       @messages = Thread::Queue.new
       @threads = []
@@ -167,6 +170,7 @@ def start_subprocess(env, extra_args, tests, process_id, record_runtime:)
           *tests
         ]
         command.unshift(ENV["BUNDLE_BIN_PATH"], "exec") if ENV["BUNDLE_BIN_PATH"]
+        command.unshift("nice") if @nice
 
         if @verbose
           command_str = [