### 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
FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND(!fd);
	MutexLock lock(fd->mutex);
	fd->subpixel_positioning = p_subpixel;
}
TextServer::SubpixelPositioning TextServerFallback::_font_get_subpixel_positioning(const RID &p_font_rid) const {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND_V(!fd, SUBPIXEL_POSITIONING_DISABLED);
	MutexLock lock(fd->mutex);
	return fd->subpixel_positioning;
}
void TextServerFallback::_font_set_embolden(const RID &p_font_rid, double p_strength) {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND(!fd);
	MutexLock lock(fd->mutex);
	if (fd->embolden != p_strength) {
		_font_clear_cache(fd);
		fd->embolden = p_strength;
	}
}
double TextServerFallback::_font_get_embolden(const RID &p_font_rid) const {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND_V(!fd, 0.0);
	MutexLock lock(fd->mutex);
	return fd->embolden;
}
void TextServerFallback::_font_set_spacing(const RID &p_font_rid, SpacingType p_spacing, int64_t p_value) {