diff --git a/anki/deck.py b/anki/deck.py
index 9e400fa99..fdf64e322 100644
--- a/anki/deck.py
+++ b/anki/deck.py
@@ -1516,7 +1516,7 @@ where id = :id""", pending)
         else:
             # memory-backed; need temp store
             if not self.tmpMediaDir and create:
-                self.tmpMediaDir = tempfile.mkdtemp()
+                self.tmpMediaDir = tempfile.mkdtemp(prefix="anki")
             dir = self.tmpMediaDir
         if not dir or not os.path.exists(dir):
             return None
diff --git a/anki/latex.py b/anki/latex.py
index e0163126c..e73af2868 100644
--- a/anki/latex.py
+++ b/anki/latex.py
@@ -27,7 +27,7 @@ regexps = {
     "math": re.compile(r"\[\$\$\](.+?)\[/\$\$\]", re.DOTALL | re.IGNORECASE),
     }
 
-tmpdir = tempfile.mkdtemp(prefix="anki-latex")
+tmpdir = tempfile.mkdtemp(prefix="anki")
 
 # add standard tex install location to osx
 if sys.platform == "darwin":
diff --git a/anki/sound.py b/anki/sound.py
index 9ea0a96b6..64e310531 100644
--- a/anki/sound.py
+++ b/anki/sound.py
@@ -46,7 +46,7 @@ processingChain = [
     None, # placeholder
     ["sox", "tmp2.wav", "tmp3.wav", "norm", NORM_AMOUNT,
      "bass", BASS_AMOUNT, "fade", FADE_AMOUNT, "0"],
-    ["lame", "tmp3.wav", processingDst, "--noreplaygain"],
+    ["lame", "tmp3.wav", processingDst, "--noreplaygain", "--quiet"],
     ]
 
 queue = []
@@ -83,7 +83,7 @@ def checkForNoiseProfile():
     if sys.platform.startswith("darwin"):
         # not currently supported
         processingChain = [
-            ["lame", "tmp.wav", "tmp.mp3", "--noreplaygain"]]
+            ["lame", "tmp.wav", "tmp.mp3", "--noreplaygain", "--quiet"]]
     else:
         cmd = ["sox", processingSrc, "tmp2.wav"]
         if os.path.exists(noiseProfile):
diff --git a/tests/test_exporting.py b/tests/test_exporting.py
index 6fe7cceaa..3375654f6 100644
--- a/tests/test_exporting.py
+++ b/tests/test_exporting.py
@@ -28,7 +28,7 @@ def setup1():
 def test_export_anki():
     oldTime = deck.modified
     e = AnkiExporter(deck)
-    newname = unicode(tempfile.mkstemp()[1])
+    newname = unicode(tempfile.mkstemp(prefix="ankitest")[1])
     os.unlink(newname)
     e.exportInto(newname)
     assert deck.modified == oldTime
@@ -36,7 +36,7 @@ def test_export_anki():
     d2 = DeckStorage.Deck(newname)
     assert d2.cardCount == 4
     # try again, limited to a tag
-    newname = unicode(tempfile.mkstemp()[1])
+    newname = unicode(tempfile.mkstemp(prefix="ankitest")[1])
     os.unlink(newname)
     e.limitTags = ['tag']
     e.exportInto(newname)
@@ -46,35 +46,17 @@ def test_export_anki():
 @nose.with_setup(setup1)
 def test_export_textcard():
     e = TextCardExporter(deck)
-    f = unicode(tempfile.mkstemp()[1])
+    f = unicode(tempfile.mkstemp(prefix="ankitest")[1])
     os.unlink(f)
     e.exportInto(f)
     e.includeTags = True
     e.exportInto(f)
 
-#     # test speed
-#     newname = unicode(tempfile.mkstemp()[1])
-#     os.unlink(newname)
-#     d = DeckStorage.Deck("/home/resolve/speed.db")
-#     import time; t = time.time()
-#     e = TextCardExporter(d)
-#     e.exportInto(newname)
-#     print time.time() - t
-
 @nose.with_setup(setup1)
 def test_export_textfact():
     e = TextFactExporter(deck)
-    f = unicode(tempfile.mkstemp()[1])
+    f = unicode(tempfile.mkstemp(prefix="ankitest")[1])
     os.unlink(f)
     e.exportInto(f)
     e.includeTags = True
     e.exportInto(f)
-
-#    # test speed
-#     newname = unicode(tempfile.mkstemp()[1])
-#     os.unlink(newname)
-#     d = DeckStorage.Deck("/home/resolve/speed.db")
-#     import time; t = time.time()
-#     e = TextFactExporter(d)
-#     e.exportInto(newname)
-#     print time.time() - t