We could also assume that radar will be developed more quickly, along with practically anything involving physics or chemistry. How long before some basic degree of CAD becomes possible here? Also, would potential improvements in radio, fire control, and torpedo guidance technology occur early enough to have an effect on WWI?
Improved electronics means earlier proximity fuses,
bad news for WW1 aircraft. It also means earlier AAMs &/or SAMs, bad news for zep bombers. Homing torpedoes are a little harder; that still needs the invention of hydrophones. You might see earlier sonobuoys, tho, coupled to ASW blimps, ASW seaplanes, or both, & later blimps with dipping 'phones (all tested by 1918 OTL, BTW). Earlier radar, plus better/faster DF, would tend to drive a demand for U-boats able to operate better submerged, so expect
schnorchel & a crude version of the Type XXI "
elektroboot", plus a demand for a way to home on convoys by tracking their radio transmissions (which was in limited production, IIRC, in WW2 OTL). Better U-boats are a terror, needless to say...
I dont think radar and crypto will appear in time to make any effect in WWI.
It will, you can bet on it. Room 40 played a big part even OTL WW1 (not least the Zimmerman telegram). Early radio means easier interception earlier, which means an earlier than OTL awareness of the need for signal security, which means something like Enigma sooner than OTL. Could be Room 40's successes against HSF are much less than OTL.... Of course, it could also mean Jellicoe listens when Room 40 warns him HSF is leaving, & he takes
Campania along (he didn't OTL...

) Greater vulnerability of radio comm tends to butterfly away wolfpacking, IMO. Early "computers" mean breaking even machine cyphers is easier, so expect more frequent changes, maybe even more complex & difficult 1st-gen machines. I'm not sure the mathematics for anything much more sophisticated than a mini version of a rotor machine existed before about 1920 & Friedman's work, tho; could be you'd see a portable typewriter-sized model equal to a 7- or 9-rotor Enigma (which would be hellish hard to crack anyhow, even with early variants of "Colossus"). And radar had been examined by 1904, but not seen as useful for anything... With the ability to do the calculations, I can see counterbattery radar by 1914. That demands SPGs, with the need to "shoot & scoot", maybe SP heavy mortar, too.
Early radio & TV also butterflies away area bombing, IMO. With the ability to have radio nav such as
Knickebein/Gee/Oboe much earlier, plus radio-guided bombs like Fritx or Azon, not to mention Felix or GB-8, hitting individual factories or powerplants won't be an issue... You'll need faster aircraft, tho, to avoid SAMs & AAMs, so expect early arrival of something like a bomber variant of the
DH.88. I'd also expect ARMs by the '20s & something like Wild Weasel in WW2. Might see a variation on X-7/X-4 before 1918 & TOW by 1940.
If not CAD, exactly, I can see machine tools approaching the capability of robots in the '20s TTL, with attendant increases in quality & output in all areas of business; this, IMO, can only reduce labor demand & lead to a higher peak for Wall Street (companies building on the fallacious OTL theory production creates demand), & deeper, harder crash (more inventory that is more durable than OTL), & a more difficult & longer time to recover (less demand for labor hence more UE, compared to OTL). With better number crunching, I'd expect aircraft to be better much sooner than OTL, as they become less dependent on "rule of thumb" & more on actual calculation & measurement; cars, trucks, ships too.
With earlier than OTL radio/TV, you see broad dissemination of music & culture much more easily, so propaganda is easier. (FDR=Reagan? Hitler more popular sooner?) Broad exposure to, & acceptance of, different kinds of music is likely. So is a "levelling" of classes (more exposure to how "the Joneses" lives means overall less "classishness" {is that a word?}). You also make it much harder to carry out "covert" oppression of blacks in U.S. (TV made a huge diff in OTL '50s-'60s civ rights movement), & probably make the Holocaust impossible; before the '40s, I picture the creation of something like CNN. You also kill off vaudeville much earlier, & butterfly away the careers of (thank God!) Milton Berle, Bob Hope, & Ed Sullivan, maybe Carson, too.
And if you can get the $ behind it, you might be able to put Man on the Moon by 1950...