As far as I understand, the Binary Data feature of Mathematica can efficiently store raw numbers or elements of a given type to binary files. Is there a way to store a large symbolic expression (read - wild mixture of all possible element types) in a binary format that can be quickly saved and loaded back into memory?

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    $\begingroup$ Why not use DumpSave? $\endgroup$ – xzczd Jun 20 '18 at 12:38
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    $\begingroup$ The wdx format is an option: reference.wolfram.com/language/ref/format/WDX.html $\endgroup$ – Gustavo Delfino Jun 20 '18 at 14:50
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    $\begingroup$ @GustavoDelfino actually BinarySerialize uses the WXF format. $\endgroup$ – rhermans Jun 20 '18 at 14:55
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    $\begingroup$ I have not checked recent versions but WDX used to be way slower than other options. Is this still the case? If it is just for quickly saving and loading on the same computer/Mathematica version then DumpSave or export to MX format seems to be by far the best bet... $\endgroup$ – Albert Retey Jun 21 '18 at 12:29

Look at BinarySerialize, particularly the option PerformanceGoal -> "Size". It's even better than Compress

data = {
   RandomReal[1, {10, 10000}],
   ExampleData[{"TestImage", "House"}],
   ExampleData[{"Dataset", "Planets"}],
   ExampleData[{"Text", "UNHumanRightsEnglish"}]

ByteCount /@ Through[{BinarySerialize, Compress}[data]]
(* {1027513, 1220720} *)

DumpSave["test1.mx", data];

dataz = BinarySerialize[data, PerformanceGoal -> "Size"];

DumpSave["test2.mx", dataz];

FileSize /@ {"test1.mx", "test2.mx"}
(* {Quantity[1.0258, "Megabytes"],  Quantity[0.915118, "Megabytes"]} *)

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