Don't recalculate tax for every price on category page

Author: Jeroen

app/code/Magento/Tax/Model/Config.php

@@ -831,20 +831,20 @@ public function getInfoUrl($store = null)
      * If it necessary will be returned conversion type (minus or plus)
      *
      * @param null|int|string|Store $store
-     * @return bool
+     * @return bool|int
      * @SuppressWarnings(PHPMD.CyclomaticComplexity)
      */
     public function needPriceConversion($store = null)
     {
-        $res = false;
+        $res = 0;
         $priceIncludesTax = $this->priceIncludesTax($store) || $this->getNeedUseShippingExcludeTax();
         if ($priceIncludesTax) {
             switch ($this->getPriceDisplayType($store)) {
                 case self::DISPLAY_TYPE_EXCLUDING_TAX:
                 case self::DISPLAY_TYPE_BOTH:
                     return self::PRICE_CONVERSION_MINUS;
                 case self::DISPLAY_TYPE_INCLUDING_TAX:
-                    $res = true;
+                    $res = false;
                     break;
                 default:
                     break;