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While the number of imports reduced a lot, "import test.support" still imports 98 modules. That's a lot! IMO we can reduce it a little bit more :-)
Examples of imports which could be lazy:
* faulthandler: move it into start_threads() and disable_faulthandler()
* shutil: move it into rmtree()
* bz2: move it into @requires_bz2 decorator. Is it possible? Same for zlib, gzip and lzma?
There are also tons of functions, it may be time to create even more submodules:
* support.threading_helper:
 * threading_setup()/threading_cleanup()
 * reap_threads()
 * wait_thread_exit()
 * join_thread()
 * catch_threading_exception context manager
 * start_threads()
* support.process_helper:
 
 * wait_process()
 * reap_children()
 * SuppressCrashReport
 * PIPE_MAX_SIZE (is it the best place for that one?)
 * args_from_interpreter_flags()
 * optim_args_from_interpreter_flags()
 * PythonSymlink
* support.file_helper: 
 * rmtree() and the related private functions
 * unlink()
 * rmdir()
 * FS_NONASCII
 * TESTFN_UNICODE, TESTFN_NONASCII, TESTFN_UNENCODABLE, TESTFN_UNDECODABLE
 * SAVEDCWD (not sure about this one)
 * TESTFN_ENCODING <= this one can be removed, it's just sys.getfilesystemencoding()
 * temp_dir()
 * change_cwd()
 * temp_cwd()
 * temp_umask()
 * create_empty_file()
 * make_bad_fd()
 * EnvironmentVarGuard (not sure about this one)
 * can_symlink(), skip_unless_symlink()
 * can_xattr(), skip_unless_xattr()
 * fs_is_case_insensitive()
 * fd_count()
 * FakePath
* support.import_helper:
 * import_module(), _ignore_deprecated_imports()
 * import_fresh_module(), _save_and_remove_module(), _save_and_block_module()
 * unload()
 * make_legacy_pyc()
 * forget()
 * CleanImport
 * DirsOnSysPath
 * modules_setup(), modules_cleanup()
* support.warnings_helper:
 * check_syntax_warning()
 * ignore_warnings()
 * WarningsRecorder
 * check_warnings(), _filterwarnings()
 * check_no_warnings()
 * check_no_resource_warning()
Move also move the following functions to socket_helper:
 * SOCK_MAX_SIZE
 * open_urlresource()
 * TransientResource
 * time_out
 * socket_peer_reset
 * ioerror_peer_reset
Serhiy: What do you think of these proposed submodules?