diff --git a/ChangeLog b/ChangeLog
index ab8093fae..240ad8a5b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -66,6 +66,8 @@ danbarry
   thanks to Jason Day - jday29
 - bug #1989081 [profiling] Profiling causes query to be executed again
   (really causes a problem in case of INSERT/UPDATE)
+- bug #1990342 [import] SQL file import very slow on Windows,
+  thanks to Richard Heaton - wotnot
 
 2.11.7.0 (not yet released)
 - bug #1908719 [interface] New field cannot be auto-increment and primary key
diff --git a/libraries/import/sql.php b/libraries/import/sql.php
index 30757a655..12be55348 100644
--- a/libraries/import/sql.php
+++ b/libraries/import/sql.php
@@ -83,6 +83,11 @@ while (!($GLOBALS['finished'] && $i >= $len) && !$error && !$timeout_passed) {
     }
     // Current length of our buffer
     $len = strlen($buffer);
+    // prepare an uppercase copy of buffer for Windows because at least
+    // on PHP 5.2.5, stripos() is very slow
+    if (PMA_IS_WINDOWS) {
+        $buffer_upper = strtoupper($buffer);
+    } 
     // Grab some SQL queries out of it
     while ($i < $len) {
         $found_delimiter = false;
@@ -126,7 +131,12 @@ while (!($GLOBALS['finished'] && $i >= $len) && !$error && !$timeout_passed) {
             $p7 = $big_value;
         }
         // catch also "delimiter"
-        $p8 = stripos($buffer, 'DELIMITER', $i);
+        // stripos() very slow on Windows (at least on PHP 5.2.5)
+        if (! PMA_IS_WINDOWS) {
+            $p8 = stripos($buffer, 'DELIMITER', $i);
+        } else {
+            $p8 = strpos($buffer_upper, 'DELIMITER', $i);
+        }
         if ($p8 === FALSE || $p8 >= ($len - 11) || $buffer[$p8 + 9] > ' ') {
             $p8 = $big_value;
         }