Entirely removes the optipng, updates ghostscript fall back to also use WebP. Updates the conversion to use a multiprocessing pool

src/paperless/checks.py

@@ -72,7 +72,7 @@ def binaries_check(app_configs, **kwargs):
     error = "Paperless can't find {}. Without it, consumption is impossible."
     hint = "Either it's not in your ${PATH} or it's not installed."
 
-    binaries = (settings.CONVERT_BINARY, settings.OPTIPNG_BINARY, "tesseract")
+    binaries = (settings.CONVERT_BINARY, "tesseract")
 
     check_messages = []
     for binary in binaries:

src/paperless/settings.py

@@ -526,8 +526,6 @@ CONSUMER_BARCODE_TIFF_SUPPORT = __get_boolean(
 
 CONSUMER_BARCODE_STRING = os.getenv("PAPERLESS_CONSUMER_BARCODE_STRING", "PATCHT")
 
-OPTIMIZE_THUMBNAILS = __get_boolean("PAPERLESS_OPTIMIZE_THUMBNAILS", "true")
-
 OCR_PAGES = int(os.getenv("PAPERLESS_OCR_PAGES", 0))
 
 # The default language that tesseract will attempt to use when parsing
@@ -570,8 +568,6 @@ CONVERT_MEMORY_LIMIT = os.getenv("PAPERLESS_CONVERT_MEMORY_LIMIT")
 
 GS_BINARY = os.getenv("PAPERLESS_GS_BINARY", "gs")
 
-OPTIPNG_BINARY = os.getenv("PAPERLESS_OPTIPNG_BINARY", "optipng")
-
 
 # Pre-2.x versions of Paperless stored your documents locally with GPG
 # encryption, but that is no longer the default.  This behaviour is still

src/paperless/tests/test_checks.py

@@ -13,9 +13,9 @@ class TestChecks(DirectoriesMixin, TestCase):
     def test_binaries(self):
         self.assertEqual(binaries_check(None), [])
 
-    @override_settings(CONVERT_BINARY="uuuhh", OPTIPNG_BINARY="forgot")
+    @override_settings(CONVERT_BINARY="uuuhh")
     def test_binaries_fail(self):
-        self.assertEqual(len(binaries_check(None)), 2)
+        self.assertEqual(len(binaries_check(None)), 1)
 
     def test_paths_check(self):
         self.assertEqual(paths_check(None), [])