Was Julius Caesar good at multitasking?

Question

A popular belief (at least in Russia) holds that Julius Caesar was good at multitasking; he was able to read, write and give orders simultaneously.

1. Julius Caesar was the first person praised for his ability to do several tasks simultaneously. He could write, read and give orders at the same time, which made his contemporaries look at him in awe.

   –"Truth About Multitasking", via Internet Archive

2. Like his physical prowess, his mind was robust with practical knowledge, excellent memory and, in today’s lingo, he could multitask with the best. His mental abilities were enhanced by his warmth of spirit. He expressed sincere affection and devotion to his mother, wives and his daughter. His ethics were beyond reproach.

   –"Regarding Julius Caesar"

3. A good example [of multitasking] is a story about Julius Caesar... Plutarch [wrote], “Caesar disciplined himself so far as to be able to dictate letters from on horseback, and to give directions to two who took notes at the same time, or as Oppius says, to more.” Plutarch’s Lives (New York, 1905), IV, p. 274. Pliny wrote, “We are told that [Caesar] used to write or read, and dictate or listen simultaneously, and to dictate to his secretaries four letters at once, on his important affairs—or, if otherwise unoccupied, seven letters at once.” Natural History (Cambridge, 1961), II, p. 565.

   –"Mastering The Multitasking"

This has become a cliche in Russian, so a Russian can say "who does he think I am, Julius Caesar?" when, say, their boss gives them too many jobs to do at once.

Is it backed by any historical evidence?

Answer 1

Probably, true.

There are several evidences in recognized sources.

Caesar disciplined himself so far as to be able to dictate letters from on horseback, and to give directions to two who took notes at the same time, or as Oppius says, to more.
— Plutarch, "Lives" (New York, 1905), IV, p. 274.

We are told that [Caesar] used to write or read, and dictate or listen simultaneously, and to dictate to his secretaries four letters at once, on his important affairs — or, if otherwise unoccupied, seven letters at once.
— Pliny, "Natural History" (Cambridge, 1961), II, p. 565.

However, there's also some critics about Caesar's multitasking phenomenon. The basic formulation of the idea can be put this way:

Caesar was required to attend most of the gladiators' fights due to the political value of Caesar's presidency at the popular shows. However, not all of these fights were interesting. So Caesar attended the shows, but at the same time did other things like reading and replying to mail, giving orders, and chatting on social networks. :)
Someone may marvelled that the great leader is capable of doing several things at once.