### 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
FontAdvanced *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND_V(!fd, 0);
	ERR_FAIL_COND_V_MSG((p_char >= 0xd800 && p_char <= 0xdfff) || (p_char > 0x10ffff), 0, "Unicode parsing error: Invalid unicode codepoint " + String::num_int64(p_char, 16) + ".");
	ERR_FAIL_COND_V_MSG((p_variation_selector >= 0xd800 && p_variation_selector <= 0xdfff) || (p_variation_selector > 0x10ffff), 0, "Unicode parsing error: Invalid unicode codepoint " + String::num_int64(p_variation_selector, 16) + ".");
	MutexLock lock(fd->mutex);
	Vector2i size = _get_size(fd, p_size);
	ERR_FAIL_COND_V(!_ensure_cache_for_size(fd, size), 0);
#ifdef MODULE_FREETYPE_ENABLED
	if (fd->cache[size]->face) {
		if (p_variation_selector) {
			return FT_Face_GetCharVariantIndex(fd->cache[size]->face, p_char, p_variation_selector);
		} else {
			return FT_Get_Char_Index(fd->cache[size]->face, p_char);
		}
	} else {
		return (int64_t)p_char;
	}
#else
	return (int64_t)p_char;
#endif
}
int64_t TextServerAdvanced::_font_get_char_from_glyph_index(const RID &p_font_rid, int64_t p_size, int64_t p_glyph_index) const {