As pointed out in D2585, champion infantry javelinists have a very high walk speed, which is actually closer to cavalry than to infantry. This patch reduces it from a ×1.75 multiplier to ×1.6, which is still twice as high as pikemen (×0.8). As a consequence these champions remain significantly faster than other infantry, but can be easier intercepted by cavalry. If necessary, their walk speed could be further reduced in the future.
Infantry walk speeds for comparison:
×1.75 champion javelinist ×1.6 *proposed* champion javelinist ×1.4 citizen javelinist ×1.4 champion maceman ×1.4 champion swordsman ×1.3 champion spearman ×1.2 champion archer ×1.2 citizen slinger ×1.1 citizen archer ×1.05 citizen swordsman ×1.05 hero swordsman ×1 hero archer ×1 hero javelinist ×1 hero spearman ×0.95 citizen spearman ×0.95 hero pikeman ×0.8 champion pikeman ×0.8 citizen pikeman
NB Only athen, pers, and spart can train champion infantry javelinists.