diff --git a/ext/fts5/fts5_vocab.c b/ext/fts5/fts5_vocab.c
index 086ef42e09..f0730ff389 100644
--- a/ext/fts5/fts5_vocab.c
+++ b/ext/fts5/fts5_vocab.c
@@ -64,6 +64,7 @@ struct Fts5VocabCursor {
 
   int nLeTerm;                    /* Size of zLeTerm in bytes */
   char *zLeTerm;                  /* (term <= $zLeTerm) paramater, or NULL */
+  int colUsed;                    /* Copy of sqlite3_index_info.colUsed */
 
   /* These are used by 'col' tables only */
   int iCol;
@@ -90,9 +91,11 @@ struct Fts5VocabCursor {
 /*
 ** Bits for the mask used as the idxNum value by xBestIndex/xFilter.
 */
-#define FTS5_VOCAB_TERM_EQ 0x01
-#define FTS5_VOCAB_TERM_GE 0x02
-#define FTS5_VOCAB_TERM_LE 0x04
+#define FTS5_VOCAB_TERM_EQ 0x0100
+#define FTS5_VOCAB_TERM_GE 0x0200
+#define FTS5_VOCAB_TERM_LE 0x0400
+
+#define FTS5_VOCAB_COLUSED_MASK 0xFF
 
 
 /*
@@ -269,11 +272,13 @@ static int fts5VocabBestIndexMethod(
   int iTermEq = -1;
   int iTermGe = -1;
   int iTermLe = -1;
-  int idxNum = 0;
+  int idxNum = (int)pInfo->colUsed;
   int nArg = 0;
 
   UNUSED_PARAM(pUnused);
 
+  assert( (pInfo->colUsed & FTS5_VOCAB_COLUSED_MASK)==pInfo->colUsed );
+
   for(i=0; i<pInfo->nConstraint; i++){
     struct sqlite3_index_constraint *p = &pInfo->aConstraint[i];
     if( p->usable==0 ) continue;
@@ -525,7 +530,9 @@ static int fts5VocabNextMethod(sqlite3_vtab_cursor *pCursor){
 
         switch( pTab->eType ){
           case FTS5_VOCAB_ROW:
-            if( eDetail==FTS5_DETAIL_FULL ){
+            /* Do not bother counting the number of instances if the "cnt"
+            ** column is not being read (according to colUsed).  */
+            if( eDetail==FTS5_DETAIL_FULL && (pCsr->colUsed & 0x04) ){
               while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
                 pCsr->aCnt[0]++;
               }
@@ -625,6 +632,7 @@ static int fts5VocabFilterMethod(
   if( idxNum & FTS5_VOCAB_TERM_EQ ) pEq = apVal[iVal++];
   if( idxNum & FTS5_VOCAB_TERM_GE ) pGe = apVal[iVal++];
   if( idxNum & FTS5_VOCAB_TERM_LE ) pLe = apVal[iVal++];
+  pCsr->colUsed = (idxNum & FTS5_VOCAB_COLUSED_MASK);
 
   if( pEq ){
     zTerm = (const char *)sqlite3_value_text(pEq);
diff --git a/manifest b/manifest
index e1799ea541..e40addb45d 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Have\sfts5\stables\sdelay\sinitializing\sthe\stokenizer\suntil\sit\sis\sfirst\sused\sin\sall\scases\swhere\sthe\stokenizer\sis\snot\s"trigram".
-D 2024-05-14T17:16:09.294
+C Avoid\scalculating\sthe\svalue\sof\sthe\s"cnt"\scolumn\sfor\sfts5vocab(row)\squeries\sthat\sdo\snot\suse\sit.
+D 2024-05-14T19:09:54.416
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -108,7 +108,7 @@ F ext/fts5/fts5_test_tok.c 3cb0a9b508b30d17ef025ccddd26ae3dc8ddffbe76c057616e59a
 F ext/fts5/fts5_tokenize.c fa5493075101540270f572038fc1723d44fcc97bfbf237c8530013b8a27860be
 F ext/fts5/fts5_unicode2.c eca63dbc797f8ff0572e97caf4631389c0ab900d6364861b915bdd4735973f00
 F ext/fts5/fts5_varint.c e64d2113f6e1bfee0032972cffc1207b77af63319746951bf1d09885d1dadf80
-F ext/fts5/fts5_vocab.c 00a098ee63290d7f6e3711f14e56f0d77f3a7c07c0a3909843fcf9826aea5b5f
+F ext/fts5/fts5_vocab.c faa8c6d8e0102037694165734a46b94d06f4460bde797af7486ed62c05764e35
 F ext/fts5/fts5parse.y eb526940f892ade5693f22ffd6c4f2702543a9059942772526eac1fde256bb05
 F ext/fts5/mkportersteps.tcl 5acf962d2e0074f701620bb5308155fa1e4a63ba
 F ext/fts5/test/fts5_common.tcl 3378732aae2a7d9a4b9b5c40bde678d4259ca16bd490883325aecc4747bcb384
@@ -2190,8 +2190,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 69ef47eeee8b53684c321393be34f03600694fbc86377f8720ff80307846aff6
-R db8162066c5e98d7999ebd78f85cf216
+P ca4fdcb8ae95d2a61236b949f852d2bf25ea2dbbff7eedafbd8eb84e8fd96687
+R 17e05953d472a335ac30c411c88ba602
 U dan
-Z 6313824362f7fdc689bb0b31fedc6732
+Z 6157f839a4ddd69a6600b93afee6568d
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index ec9f975d50..125d507b0d 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-ca4fdcb8ae95d2a61236b949f852d2bf25ea2dbbff7eedafbd8eb84e8fd96687
\ No newline at end of file
+c0c91e306c252ce1b398e92ab958e2a3de0fc43db05cfdffc548380654fc9f13
\ No newline at end of file