Use `org-element-at-point-no-context' in performance-critical places

* lisp/org-compat.el (org-mode-flyspell-verify, org-indent-line,
org-indent-region, org-indent-drawer, org-indent-block): Use
`org-element-at-point-no-context' in place of `org-element-at-point'
when we are doing changes.
* lisp/org.el (org-collect-keywords): Use direct parsing in place of
`org-elemnt-at-point'

lisp/org-compat.el

@@ -1047,8 +1047,8 @@ ELEMENT is the element at point."
 	   (or (not (match-beginning 5))
 	       (< (point) (match-beginning 5)))
            ;; Ignore checks in code, verbatim and others.
-           (org--flyspell-object-check-p (org-element-at-point)))
-    (let* ((element (org-element-at-point))
+           (org--flyspell-object-check-p (org-element-at-point-no-context)))
+    (let* ((element (org-element-at-point-no-context))
 	   (post-affiliated (org-element-property :post-affiliated element)))
       (cond
        ;; Ignore checks in all affiliated keywords but captions.

lisp/org.el

@@ -4537,7 +4537,7 @@ directory."
     (let ((case-fold-search t)
 	  (regexp (org-make-options-regexp keywords)))
       (while (and keywords (re-search-forward regexp nil t))
-        (let ((element (org-element-at-point)))
+        (let ((element (org-with-point-at (match-beginning 0) (org-element-keyword-parser (line-end-position) (list (match-beginning 0))))))
           (when (eq 'keyword (org-element-type element))
             (let ((value (org-element-property :value element)))
               (pcase (org-element-property :key element)
@@ -19271,7 +19271,7 @@ Also align node properties according to `org-property-format'."
                      (skip-chars-backward "\n")
                      (or (org-at-heading-p)
                          (looking-back ":END:.*" (point-at-bol))))))
-    (let* ((element (save-excursion (beginning-of-line) (org-element-at-point)))
+    (let* ((element (save-excursion (beginning-of-line) (org-element-at-point-no-context)))
 	   (type (org-element-type element)))
       (cond ((and (memq type '(plain-list item))
 		  (= (line-beginning-position)
@@ -19344,7 +19344,7 @@ assumed to be significant there."
 	  (end (copy-marker end)))
       (while (< (point) end)
 	(if (or (looking-at-p " \r\t\n") (org-at-heading-p)) (forward-line)
-	  (let* ((element (org-element-at-point))
+	  (let* ((element (org-element-at-point-no-context))
 		 (type (org-element-type element))
 		 (element-end (copy-marker (org-element-property :end element)))
 		 (ind (org--get-expected-indentation element nil)))
@@ -19450,7 +19450,7 @@ assumed to be significant there."
 	    (beginning-of-line)
 	    (looking-at-p org-drawer-regexp))
     (user-error "Not at a drawer"))
-  (let ((element (org-element-at-point)))
+  (let ((element (org-element-at-point-no-context)))
     (unless (memq (org-element-type element) '(drawer property-drawer))
       (user-error "Not at a drawer"))
     (org-with-wide-buffer
@@ -19466,7 +19466,7 @@ assumed to be significant there."
 	    (let ((case-fold-search t))
 	      (looking-at-p "[ \t]*#\\+\\(begin\\|end\\)_")))
     (user-error "Not at a block"))
-  (let ((element (org-element-at-point)))
+  (let ((element (org-element-at-point-no-context)))
     (unless (memq (org-element-type element)
 		  '(comment-block center-block dynamic-block example-block
 				  export-block quote-block special-block