diff --git a/copyparty/mtag.py b/copyparty/mtag.py
index c3fffd21..5fa1b79a 100644
--- a/copyparty/mtag.py
+++ b/copyparty/mtag.py
@@ -324,6 +324,9 @@ class MTag(object):
         for tagname, (binpath, timeout) in parsers.items():
             try:
                 cmd = [sys.executable, binpath, abspath]
+                if not WINDOWS:
+                    cmd = ["nice"] + cmd
+
                 cmd = [fsenc(x) for x in cmd]
                 v = sp.check_output(cmd, env=env, timeout=timeout).strip()
                 if v: