It does not affect block at all, positively or negatively.
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i just said it in Help Tab too, i hope they stick with this one at least, this is awesome. I was saying about [B]Jog[B] a few thousand times that they should keep the "[I]going faster to an attack[I]" but everybody wanted the "[I]safer[I]" blocks, which even disappeared in a very high amount after the [B]XP[B] boost and [B]Star Coin[B] collecting skill for [B]Generals[B] got tried out and hit the top of interests. Had to wait till more than one or two Generals had it and were [B]maxed[B] with the rest of the skills to get proven how [B]useless[B] many blocks became to a fair number of people.
Even if everybody would have sticked to max blocking everybody could still change the positions - change the flag counts - change the whole guide while they're at it? Or why the hell not simply upgrade them all the same, the exact way you want to upgrade them? Either zero speed in attacking or full speed for all Generals, or just watch out which General you use? Isn't it the same as using the un-upgraded Major with zero books on him against using the fully booked Major in an attack and losing all expensive troops?...
Anyway, just had to say it but added a spoiler below to the more direct comment on this topic.
Spoiler
Sorry for the wall of text but tried to be as clear as possible without using any unnecessities. Happy Settling. :)
It does affect blocks, positively.
General A starts fight (Block 1), general B walks 50 more seconds, start fight (block 2), general C walks 90 more seconds (or 40 more than gen B), starts fight (leader camp). Those 90 seconds of walk for general C, should become less than 80 seconds (with bronze horseshoe), thus "giving" you 1 extra round of blocking on camp A.
There is only one truth in this matter and to discover it you need to try it your self and see what the results are. What other players are saying in both the pro and con camps is the results of their tests. Only you have your device running your browser of choice connected via your ISP to your server.
If you are doing a multi general block that requires precise timing and delays the extra speed will of course slightly contribute to the process so its wrong to say it has no effect at all. Someone might have previously succeeded even the harder ones in bad conditions but might not with the speed buff. 15% is almost a second from 5 seconds. If a guide for example tells you to send a general when the other one is at specific position (flag) the timing has higher error margin than previously depending of course how tight the block is.
That would be true IF combat round times also were affected by 15%. Here the time span is the very same and the margin are actually greater thanks to shorter time needed to pass aggro zone.
Also, it seems like you're confusing with complex multi general blocks containing intentional intercepts, but that's another deal - just some adjustments needed there.
Actually when you send first attack, the general will walk more than the distance that he walks without buff, so as for example, if you send general A, then you went to general B, click, click attack, find camp and click on camp, the general A will be walked already 2 flags instead of 1 flag, so he will start block earlier, thats not problem because the attacker general will pass red zone faster, so, it is really does not affect the blocks at all, unless you super computer and you can send all generals with one click, then you can say the speed make blocks easier or opens more block options, add that really very few blocks options are tight like that, it is only applied to 1R blocks if it was possible anyway.
I'm so timing all* my blocks with horseshoe - I just need to know if it works (I don't play on test server).
Just did C8 + Leader 6 block in Princess (reverse order), where Major needs 64 seconds to start his fight after block starts. With horseshoe it was ca. 55 seconds.
I click to send generals at the same speed as I did before, my capacities in that matter haven't changed. While sometimes it takes indeed ca. 3-6 seconds to click, locate the target camp on the map with mouse cursor and click again, this delay was present there before. With horseshoe it means up to 1 second in some harder cases, but the walks through aggro zones - with single blocks - take usually 20-60 seconds, that's 3-9 seconds difference. And with double blocks it's really even better. You should try those double blocks on 1st Thief Final Attack that some guides have to see the difference.
* Not really "all" blocks, I'm not that crazy, just the interesting ones, where I can see the difference or have time look at the watch.