### 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);
	if (fd->mipmaps != p_generate_mipmaps) {
		for (KeyValue<Vector2i, FontForSizeFallback *> &E : fd->cache) {
			for (int i = 0; i < E.value->textures.size(); i++) {
				E.value->textures.write[i].dirty = true;
				E.value->textures.write[i].texture = Ref<ImageTexture>();
			}
		}
		fd->mipmaps = p_generate_mipmaps;
	}
}
bool TextServerFallback::_font_get_generate_mipmaps(const RID &p_font_rid) const {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND_V(!fd, false);
	MutexLock lock(fd->mutex);
	return fd->mipmaps;
}
void TextServerFallback::_font_set_multichannel_signed_distance_field(const RID &p_font_rid, bool p_msdf) {
	FontFallback *fd = font_owner.get_or_null(p_font_rid);
	ERR_FAIL_COND(!fd);
	MutexLock lock(fd->mutex);
	if (fd->msdf != p_msdf) {
		_font_clear_cache(fd);
		fd->msdf = p_msdf;
	}
}
bool TextServerFallback::_font_is_multichannel_signed_distance_field(const RID &p_font_rid) const {