Cloudflare, which blocks assaults designed to knock web sites offline, says advocacy corporations in usual noticed assaults amplify 1,120-fold.
Mr Floyd's death, in police custody, has sparked nationwide civil unrest in the US.
Government and navy web sites additionally noticed a super expand in attacks.
DDoS assaults - brief for Distributed Denial of Service - are a fantastically easy cyber-attack tool, in which the attacker tries to flood a internet site or different on-line carrier with so many faux "users" that it can't cope.
The impact is that it receives knocked offline for humans attempting to get right of entry to statistics or services.
Cloudflare says that after Mr Floyd's dying and the ensuing violent clashes between police and protesters, it noticed a great soar in the quantity of requests it blocked - an more 19 billion (17%) from the corresponding weekend the preceding month.
That equates to an greater 110,000 blocked requests each and every second, it said.
The hassle was once specially acute for positive sorts of organisations. One single internet site belonging to an unnamed advocacy crew dealt with 20,000 requests a second.
Anti-racism corporations which belong to Cloudflare's free programme for at-risk firms noticed a massive surge in the previous week, from near-zero to extra than a hundred and twenty million blocked requests.
Attacks on authorities and army web sites have been additionally up - through 1.8 and 3.8 instances respectively.
It follows a surprising swell of pastime in the "hacktivist" collective Anonymous, which has stated it will aid the protesters, and threatened to goal the police in the metropolis of Minneapolis, the place George Floyd used to be killed. The team has frequently used DDoS assaults in the past.
Cloudflare, meanwhile, invited at-risk businesses to be a part of its free safety programme.
"As we have frequently viewed in the past, actual world protest and violence is commonly accompanied via attacks on the internet," Cloudflare stated in a weblog put up written by means of its chief government and chief science officer.
"Unfortunately, if current records is any guide, these who talk out in opposition to oppression will proceed to face cyber-attacks that strive to silence them."
