### Godot version

8449592d92eaeef990f5502b419d491ee3eeb7a6

### System information

Windows 11

### Issue description

Zooming in the script editor on an empty script freezes the entire editor for a few seconds, but if the file is large then it freezes for 4-5 seconds (which is unacceptable). Looks like a recent regression.

### Steps to reproduce

Just zoom in/out on the large script file.

### Minimal reproduction project

N/A
ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
	ERR_FAIL_COND_V(!sd, 0.0);
	MutexLock lock(sd->mutex);
	if (!sd->valid) {
		const_cast<TextServerFallback *>(this)->_shaped_text_shape(p_shaped);
	}
	if (!sd->justification_ops_valid) {
		const_cast<TextServerFallback *>(this)->_shaped_text_update_justification_ops(p_shaped);
	}
	int start_pos = 0;
	int end_pos = sd->glyphs.size() - 1;
	if (p_jst_flags.has_flag(JUSTIFICATION_AFTER_LAST_TAB)) {
		int start, end, delta;
		if (sd->para_direction == DIRECTION_LTR) {
			start = sd->glyphs.size() - 1;
			end = -1;
			delta = -1;
		} else {
			start = 0;
			end = sd->glyphs.size();
			delta = +1;
		}
		for (int i = start; i != end; i += delta) {
			if ((sd->glyphs[i].flags & GRAPHEME_IS_TAB) == GRAPHEME_IS_TAB) {
				if (sd->para_direction == DIRECTION_LTR) {