configure pywikidiff2 cache limits.

src/wikiq/wiki_diff_matcher.py

@@ -330,15 +330,17 @@ class WikiDiffMatcher:
     ):
         self.tokenizer = tokenizer or TOKENIZER
 
-            
-
     class Processor(DiffEngine.Processor):
         def __init__(self, tokenizer=None):
             self.tokenizer = tokenizer or TOKENIZER
             self.last_tokens = []
             self.previous_text = ""
             self.differ = pywikidiff2.pywikidiff2(
-                numContextLines=1000000, moved_paragraph_detection_cutoff=200000
+                numContextLines=1000000,
+                moved_paragraph_detection_cutoff=200000,
+                words_cache_capacity=10000,
+                diff_cache_capacity=10000,
+                stats_cache_capacity=100000,
             )
             self.last_diff = None